31518378052 has 24 divisors (see below), whose sum is σ = 63045864896. Its totient is φ = 13505924448.

The previous prime is 31518377993. The next prime is 31518378107. The reversal of 31518378052 is 25087381513.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125098 + ... + 280510.

Almost surely, 2^31518378052 is an apocalyptic number.

It is an amenable number.

31518378052 is an abundant number, since it is smaller than the sum of its proper divisors (31527486844).

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

31518378052 is a wasteful number, since it uses less digits than its factorization.

31518378052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162667 (or 162665 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 31518378052 in words is "thirty-one billion, five hundred eighteen million, three hundred seventy-eight thousand, fifty-two".