31638869659 has 16 divisors (see below), whose sum is σ = 32349335040. Its totient is φ = 30937140000.

The previous prime is 31638869657. The next prime is 31638869671. The reversal of 31638869659 is 95696883613.

It is a cyclic number.

It is not a de Polignac number, because 31638869659 - 2¹ = 31638869657 is a prime.

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 31638869659.

It is not an unprimeable number, because it can be changed into a prime (31638869657) 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, 5595984 + ... + 5601634.

It is an arithmetic number, because the mean of its divisors is an integer number (2021833440).

Almost surely, 2^31638869659 is an apocalyptic number.

31638869659 is a deficient number, since it is larger than the sum of its proper divisors (710465381).

31638869659 is a wasteful number, since it uses less digits than its factorization.

31638869659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6402.

The product of its digits is 50388480, while the sum is 64.

The spelling of 31638869659 in words is "thirty-one billion, six hundred thirty-eight million, eight hundred sixty-nine thousand, six hundred fifty-nine".