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9947668649 is a prime number
BaseRepresentation
bin10010100001110110…
…10110000010101001
3221200021021221000012
421100323112002221
5130333100344044
64323033021305
7501340534262
oct112073260251
927607257005
109947668649
114245221766
121b17554835
13c26bc6b89
146a521d969
153d34c259e
hex250ed60a9

9947668649 has 2 divisors, whose sum is σ = 9947668650. Its totient is φ = 9947668648.

The previous prime is 9947668637. The next prime is 9947668693. The reversal of 9947668649 is 9468667499.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9876384400 + 71284249 = 99380^2 + 8443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-9947668649 is a prime.

It is a super-2 number, since 2×99476686492 (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9947668699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4973834324 + 4973834325.

It is an arithmetic number, because the mean of its divisors is an integer number (4973834325).

Almost surely, 29947668649 is an apocalyptic number.

It is an amenable number.

9947668649 is a deficient number, since it is larger than the sum of its proper divisors (1).

9947668649 is an equidigital number, since it uses as much as digits as its factorization.

9947668649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141087744, while the sum is 68.

The square root of 9947668649 is about 99738.0000250657. Note that the first 4 decimals coincide. The cubic root of 9947668649 is about 2150.6699660060.

The spelling of 9947668649 in words is "nine billion, nine hundred forty-seven million, six hundred sixty-eight thousand, six hundred forty-nine".