9918507864 has 32 divisors (see below), whose sum is σ = 24798709440. Its totient is φ = 3305844000.

The previous prime is 9918507847. The next prime is 9918507899. The reversal of 9918507864 is 4687058199.

It is a congruent number.

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, 470919 + ... + 491529.

It is an arithmetic number, because the mean of its divisors is an integer number (774959670).

Almost surely, 2^9918507864 is an apocalyptic number.

It is an amenable number.

9918507864 is an abundant number, since it is smaller than the sum of its proper divisors (14880201576).

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

9918507864 is a wasteful number, since it uses less digits than its factorization.

9918507864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40671 (or 40667 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 57.

The square root of 9918507864 is about 99591.7057992281. The cubic root of 9918507864 is about 2148.5664042493.

The spelling of 9918507864 in words is "nine billion, nine hundred eighteen million, five hundred seven thousand, eight hundred sixty-four".