2157664986 has 32 divisors (see below), whose sum is σ = 4798800000. Its totient is φ = 718623360.

The previous prime is 2157664979. The next prime is 2157664991. The reversal of 2157664986 is 6894667512.

2157664986 is a `hidden beast` number, since 2 + 1 + 576 + 64 + 9 + 8 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51451 + ... + 83441.

It is an arithmetic number, because the mean of its divisors is an integer number (149962500).

Almost surely, 2^2157664986 is an apocalyptic number.

2157664986 is an abundant number, since it is smaller than the sum of its proper divisors (2641135014).

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

2157664986 is a wasteful number, since it uses less digits than its factorization.

2157664986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33251 (or 33245 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 2157664986 is about 46450.6726108460. The cubic root of 2157664986 is about 1292.1948465191.

The spelling of 2157664986 in words is "two billion, one hundred fifty-seven million, six hundred sixty-four thousand, nine hundred eighty-six".