31690668018 has 16 divisors (see below), whose sum is σ = 63606895776. Its totient is φ = 10525962720.

The previous prime is 31690668011. The next prime is 31690668029. The reversal of 31690668018 is 81086609613.

It is not an unprimeable number, because it can be changed into a prime (31690668011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9396496 + ... + 9399867.

It is an arithmetic number, because the mean of its divisors is an integer number (3975430986).

Almost surely, 2^31690668018 is an apocalyptic number.

31690668018 is an abundant number, since it is smaller than the sum of its proper divisors (31916227758).

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

31690668018 is a wasteful number, since it uses less digits than its factorization.

31690668018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18796649.

The product of its (nonzero) digits is 373248, while the sum is 48.

The spelling of 31690668018 in words is "thirty-one billion, six hundred ninety million, six hundred sixty-eight thousand, eighteen".