39997992051 has 10 divisors (see below), whose sum is σ = 59750087012. Its totient is φ = 26665327980.

The previous prime is 39997992043. The next prime is 39997992053. The reversal of 39997992051 is 15029979993.

39997992051 is a `hidden beast` number, since 399 + 97 + 99 + 20 + 51 = 666.

It is not a de Polignac number, because 39997992051 - 2³ = 39997992043 is a prime.

It is a super-2 number, since 2×39997992051² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39997992051.

It is not an unprimeable number, because it can be changed into a prime (39997992053) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 246901105 + ... + 246901266.

Almost surely, 2^39997992051 is an apocalyptic number.

39997992051 is a deficient number, since it is larger than the sum of its proper divisors (19752094961).

39997992051 is an equidigital number, since it uses as much as digits as its factorization.

39997992051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493802383 (or 493802374 counting only the distinct ones).

The product of its (nonzero) digits is 12400290, while the sum is 63.

The spelling of 39997992051 in words is "thirty-nine billion, nine hundred ninety-seven million, nine hundred ninety-two thousand, fifty-one".