2157512664 has 32 divisors (see below), whose sum is σ = 5467673520. Its totient is φ = 709318656.

The previous prime is 2157512639. The next prime is 2157512671. The reversal of 2157512664 is 4662157512.

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, 613977 + ... + 617480.

Almost surely, 2^2157512664 is an apocalyptic number.

2157512664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2157512664 is an abundant number, since it is smaller than the sum of its proper divisors (3310160856).

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

2157512664 is a wasteful number, since it uses less digits than its factorization.

2157512664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231539 (or 1231535 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The square root of 2157512664 is about 46449.0329716346. The cubic root of 2157512664 is about 1292.1644379777.

The spelling of 2157512664 in words is "two billion, one hundred fifty-seven million, five hundred twelve thousand, six hundred sixty-four".