2163551664 has 20 divisors (see below), whose sum is σ = 5589175256. Its totient is φ = 721183872.

The previous prime is 2163551657. The next prime is 2163551711. The reversal of 2163551664 is 4661553612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22536949 + ... + 22537044.

Almost surely, 2^2163551664 is an apocalyptic number.

2163551664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2163551664 is an abundant number, since it is smaller than the sum of its proper divisors (3425623592).

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

2163551664 is a wasteful number, since it uses less digits than its factorization.

2163551664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45074004 (or 45073998 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 2163551664 is about 46513.9942812913. The cubic root of 2163551664 is about 1293.3689286504.

The spelling of 2163551664 in words is "two billion, one hundred sixty-three million, five hundred fifty-one thousand, six hundred sixty-four".