9618661964 has 24 divisors (see below), whose sum is σ = 17199529200. Its totient is φ = 4705032384.

The previous prime is 9618661957. The next prime is 9618661981. The reversal of 9618661964 is 4691668169.

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, 8987 + ... + 138989.

It is an arithmetic number, because the mean of its divisors is an integer number (716647050).

Almost surely, 2^9618661964 is an apocalyptic number.

It is an amenable number.

9618661964 is a deficient number, since it is larger than the sum of its proper divisors (7580867236).

9618661964 is a wasteful number, since it uses less digits than its factorization.

9618661964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130409 (or 130407 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 56.

The square root of 9618661964 is about 98074.7774098927. Note that the first 3 decimals coincide. The cubic root of 9618661964 is about 2126.6934202710.

The spelling of 9618661964 in words is "nine billion, six hundred eighteen million, six hundred sixty-one thousand, nine hundred sixty-four".