2155209964 has 18 divisors (see below), whose sum is σ = 3795967140. Its totient is φ = 1070692272.

The previous prime is 2155209949. The next prime is 2155210019. The reversal of 2155209964 is 4699025512.

It is a self number, because there is not a number n which added to its sum of digits gives 2155209964.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87667 + ... + 109525.

Almost surely, 2^2155209964 is an apocalyptic number.

It is an amenable number.

2155209964 is a deficient number, since it is larger than the sum of its proper divisors (1640757176).

2155209964 is a wasteful number, since it uses less digits than its factorization.

2155209964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22177 (or 22018 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 2155209964 is about 46424.2389706067. The cubic root of 2155209964 is about 1291.7045679469.

The spelling of 2155209964 in words is "two billion, one hundred fifty-five million, two hundred nine thousand, nine hundred sixty-four".