231718136440 has 64 divisors (see below), whose sum is σ = 608006808000. Its totient is φ = 79446213504.

The previous prime is 231718136413. The next prime is 231718136473. The reversal of 231718136440 is 44631817132.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 231718136393 and 231718136402.

It is a congruent 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, 8430819 + ... + 8458258.

It is an arithmetic number, because the mean of its divisors is an integer number (9500106375).

Almost surely, 2^231718136440 is an apocalyptic number.

231718136440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231718136440 is an abundant number, since it is smaller than the sum of its proper divisors (376288671560).

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

231718136440 is a wasteful number, since it uses less digits than its factorization.

231718136440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16889109 (or 16889091 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 231718136440 in words is "two hundred thirty-one billion, seven hundred eighteen million, one hundred thirty-six thousand, four hundred forty".