31543664523 has 32 divisors (see below), whose sum is σ = 48377856000. Its totient is φ = 17908472736.

The previous prime is 31543664513. The next prime is 31543664527. The reversal of 31543664523 is 32546634513.

It is not a de Polignac number, because 31543664523 - 2⁴ = 31543664507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31543664527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3099918 + ... + 3110076.

It is an arithmetic number, because the mean of its divisors is an integer number (1511808000).

Almost surely, 2^31543664523 is an apocalyptic number.

31543664523 is a deficient number, since it is larger than the sum of its proper divisors (16834191477).

31543664523 is a wasteful number, since it uses less digits than its factorization.

31543664523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11111.

The product of its digits is 777600, while the sum is 42.

The spelling of 31543664523 in words is "thirty-one billion, five hundred forty-three million, six hundred sixty-four thousand, five hundred twenty-three".