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9947668645 = 59720510657
BaseRepresentation
bin10010100001110110…
…10110000010100101
3221200021021221000001
421100323112002211
5130333100344040
64323033021301
7501340534255
oct112073260245
927607257001
109947668645
114245221762
121b17554831
13c26bc6b85
146a521d965
153d34c259a
hex250ed60a5

9947668645 has 8 divisors (see below), whose sum is σ = 12060266904. Its totient is φ = 7876091904.

The previous prime is 9947668637. The next prime is 9947668649. The reversal of 9947668645 is 5468667499.

It is a happy number.

It is a Cunningham number, because it is equal to 997382+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 9947668644 = 1^2 + 99738^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9947668645 - 23 = 9947668637 is a prime.

It is a super-2 number, since 2×99476686452 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9947668649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10254844 + ... + 10255813.

It is an arithmetic number, because the mean of its divisors is an integer number (1507533363).

Almost surely, 29947668645 is an apocalyptic number.

It is an amenable number.

9947668645 is a deficient number, since it is larger than the sum of its proper divisors (2112598259).

9947668645 is a wasteful number, since it uses less digits than its factorization.

9947668645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20510759.

The product of its digits is 78382080, while the sum is 64.

The square root of 9947668645 is about 99738.0000050131. Note that the first 5 decimals coincide. The cubic root of 9947668645 is about 2150.6699657177.

The spelling of 9947668645 in words is "nine billion, nine hundred forty-seven million, six hundred sixty-eight thousand, six hundred forty-five".

Divisors: 1 5 97 485 20510657 102553285 1989533729 9947668645