399996660610431 has 12 divisors (see below), whose sum is σ = 580766596467408. Its totient is φ = 265282759367424.

The previous prime is 399996660610423. The next prime is 399996660610447. The reversal of 399996660610431 is 134016066699993.

It is not a de Polignac number, because 399996660610431 - 2³ = 399996660610423 is a prime.

It is a super-2 number, since 2×399996660610431² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399996660610431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399996660610411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115140084795 + ... + 115140088268.

It is an arithmetic number, because the mean of its divisors is an integer number (48397216372284).

Almost surely, 2^{399996660610431} is an apocalyptic number.

399996660610431 is a deficient number, since it is larger than the sum of its proper divisors (180769935856977).

399996660610431 is a wasteful number, since it uses less digits than its factorization.

399996660610431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230280173262 (or 230280173259 counting only the distinct ones).

The product of its (nonzero) digits is 306110016, while the sum is 72.

The spelling of 399996660610431 in words is "three hundred ninety-nine trillion, nine hundred ninety-six billion, six hundred sixty million, six hundred ten thousand, four hundred thirty-one".