31816665036 has 36 divisors (see below), whose sum is σ = 86612033872. Its totient is φ = 9789742944.

The previous prime is 31816664989. The next prime is 31816665043. The reversal of 31816665036 is 63056661813.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 31816664982 and 31816665000.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33991696 + ... + 33992631.

Almost surely, 2^31816665036 is an apocalyptic number.

31816665036 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31816665036 is an abundant number, since it is smaller than the sum of its proper divisors (54795368836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31816665036 is a wasteful number, since it uses less digits than its factorization.

31816665036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67984350 (or 67984345 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 31816665036 in words is "thirty-one billion, eight hundred sixteen million, six hundred sixty-five thousand, thirty-six".