39997999957 has 2 divisors, whose sum is σ = 39997999958. Its totient is φ = 39997999956.

The previous prime is 39997999919. The next prime is 39998000041. The reversal of 39997999957 is 75999979993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39288789796 + 709210161 = 198214^2 + 26631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39997999957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39997999057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19998999978 + 19998999979.

It is an arithmetic number, because the mean of its divisors is an integer number (19998999979).

Almost surely, 2^39997999957 is an apocalyptic number.

It is an amenable number.

39997999957 is a deficient number, since it is larger than the sum of its proper divisors (1).

39997999957 is an equidigital number, since it uses as much as digits as its factorization.

39997999957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3515482215, while the sum is 85.

The spelling of 39997999957 in words is "thirty-nine billion, nine hundred ninety-seven million, nine hundred ninety-nine thousand, nine hundred fifty-seven".