8540561664 has 108 divisors (see below), whose sum is σ = 25695336576. Its totient is φ = 2723060736.

The previous prime is 8540561599. The next prime is 8540561699. The reversal of 8540561664 is 4661650458.

8540561664 is a `hidden beast` number, since 85 + 4 + 0 + 561 + 6 + 6 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27592 + ... + 133575.

Almost surely, 2^8540561664 is an apocalyptic number.

It is an amenable number.

8540561664 is an abundant number, since it is smaller than the sum of its proper divisors (17154774912).

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

8540561664 is a wasteful number, since it uses less digits than its factorization.

8540561664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161212 (or 161195 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 8540561664 is about 92415.1592759543. The cubic root of 8540561664 is about 2044.0686504134.

The spelling of 8540561664 in words is "eight billion, five hundred forty million, five hundred sixty-one thousand, six hundred sixty-four".