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9947668637 is a prime number
BaseRepresentation
bin10010100001110110…
…10110000010011101
3221200021021220222202
421100323112002131
5130333100344022
64323033021245
7501340534244
oct112073260235
927607256882
109947668637
114245221755
121b17554825
13c26bc6b7a
146a521d95b
153d34c2592
hex250ed609d

9947668637 has 2 divisors, whose sum is σ = 9947668638. Its totient is φ = 9947668636.

The previous prime is 9947668571. The next prime is 9947668649. The reversal of 9947668637 is 7368667499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6937390681 + 3010277956 = 83291^2 + 54866^2 .

It is an emirp because it is prime and its reverse (7368667499) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-9947668637 is a prime.

It is a super-2 number, since 2×99476686372 (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9947668697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4973834318 + 4973834319.

It is an arithmetic number, because the mean of its divisors is an integer number (4973834319).

Almost surely, 29947668637 is an apocalyptic number.

It is an amenable number.

9947668637 is a deficient number, since it is larger than the sum of its proper divisors (1).

9947668637 is an equidigital number, since it uses as much as digits as its factorization.

9947668637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82301184, while the sum is 65.

The square root of 9947668637 is about 99737.9999649081. Note that the first 4 decimals coincide. The cubic root of 9947668637 is about 2150.6699651412.

The spelling of 9947668637 in words is "nine billion, nine hundred forty-seven million, six hundred sixty-eight thousand, six hundred thirty-seven".