3957663521631 has 16 divisors (see below), whose sum is σ = 5423612198400. Its totient is φ = 2565186727968.

The previous prime is 3957663521627. The next prime is 3957663521633. The reversal of 3957663521631 is 1361253667593.

It is not a de Polignac number, because 3957663521631 - 2² = 3957663521627 is a prime.

It is a super-2 number, since 2×3957663521631² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3957663521633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13369371 + ... + 13662188.

It is an arithmetic number, because the mean of its divisors is an integer number (338975762400).

Almost surely, 2^{3957663521631} is an apocalyptic number.

3957663521631 is a deficient number, since it is larger than the sum of its proper divisors (1465948676769).

3957663521631 is a wasteful number, since it uses less digits than its factorization.

3957663521631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27032918.

The product of its digits is 18370800, while the sum is 57.

The spelling of 3957663521631 in words is "three trillion, nine hundred fifty-seven billion, six hundred sixty-three million, five hundred twenty-one thousand, six hundred thirty-one".