31640503265 has 16 divisors (see below), whose sum is σ = 45279330048. Its totient is φ = 20753025216.

The previous prime is 31640503253. The next prime is 31640503291. The reversal of 31640503265 is 56230504613.

It is not a de Polignac number, because 31640503265 - 2⁶ = 31640503201 is a prime.

It is a super-2 number, since 2×31640503265² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19651682 + ... + 19653291.

It is an arithmetic number, because the mean of its divisors is an integer number (2829958128).

Almost surely, 2^31640503265 is an apocalyptic number.

31640503265 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31640503265 is a deficient number, since it is larger than the sum of its proper divisors (13638826783).

31640503265 is a wasteful number, since it uses less digits than its factorization.

31640503265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39305008.

The product of its (nonzero) digits is 64800, while the sum is 35.

The spelling of 31640503265 in words is "thirty-one billion, six hundred forty million, five hundred three thousand, two hundred sixty-five".