2156214565 has 16 divisors (see below), whose sum is σ = 2630073600. Its totient is φ = 1696790592.

The previous prime is 2156214547. The next prime is 2156214581. The reversal of 2156214565 is 5654126512.

It is a cyclic number.

It is not a de Polignac number, because 2156214565 - 2²³ = 2147825957 is a prime.

It is a super-2 number, since 2×2156214565² = 9298522500636278450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61524 + ... + 89986.

It is an arithmetic number, because the mean of its divisors is an integer number (164379600).

Almost surely, 2^2156214565 is an apocalyptic number.

It is an amenable number.

2156214565 is a deficient number, since it is larger than the sum of its proper divisors (473859035).

2156214565 is a wasteful number, since it uses less digits than its factorization.

2156214565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28716.

The product of its digits is 72000, while the sum is 37.

The square root of 2156214565 is about 46435.0574996952. The cubic root of 2156214565 is about 1291.9052361188.

The spelling of 2156214565 in words is "two billion, one hundred fifty-six million, two hundred fourteen thousand, five hundred sixty-five".