9942565657 has 2 divisors, whose sum is σ = 9942565658. Its totient is φ = 9942565656.

The previous prime is 9942565643. The next prime is 9942565679. The reversal of 9942565657 is 7565652499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8248090761 + 1694474896 = 90819^2 + 41164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9942565657 is a prime.

It is a super-2 number, since 2×9942565657² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9942565057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4971282828 + 4971282829.

It is an arithmetic number, because the mean of its divisors is an integer number (4971282829).

Almost surely, 2^9942565657 is an apocalyptic number.

It is an amenable number.

9942565657 is a deficient number, since it is larger than the sum of its proper divisors (1).

9942565657 is an equidigital number, since it uses as much as digits as its factorization.

9942565657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412000, while the sum is 58.

The square root of 9942565657 is about 99712.4147586448. The cubic root of 9942565657 is about 2150.3021502161.

The spelling of 9942565657 in words is "nine billion, nine hundred forty-two million, five hundred sixty-five thousand, six hundred fifty-seven".