2157664306 has 32 divisors (see below), whose sum is σ = 3772758528. Its totient is φ = 906344640.

The previous prime is 2157664261. The next prime is 2157664307. The reversal of 2157664306 is 6034667512.

It is not an unprimeable number, because it can be changed into a prime (2157664307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245911 + ... + 254533.

It is an arithmetic number, because the mean of its divisors is an integer number (117898704).

Almost surely, 2^2157664306 is an apocalyptic number.

2157664306 is a deficient number, since it is larger than the sum of its proper divisors (1615094222).

2157664306 is a wasteful number, since it uses less digits than its factorization.

2157664306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8986.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 2157664306 is about 46450.6652912528. The cubic root of 2157664306 is about 1292.1947107717.

The spelling of 2157664306 in words is "two billion, one hundred fifty-seven million, six hundred sixty-four thousand, three hundred six".