2156411565 has 80 divisors (see below), whose sum is σ = 4819478400. Its totient is φ = 896158080.

The previous prime is 2156411557. The next prime is 2156411599. The reversal of 2156411565 is 5651146512.

2156411565 is a `hidden beast` number, since 2 + 1 + 5 + 641 + 1 + 5 + 6 + 5 = 666.

It is not a de Polignac number, because 2156411565 - 2³ = 2156411557 is a prime.

It is a super-2 number, since 2×2156411565² = 9300221675331498450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3390 + ... + 65759.

It is an arithmetic number, because the mean of its divisors is an integer number (60243480).

Almost surely, 2^2156411565 is an apocalyptic number.

It is an amenable number.

2156411565 is an abundant number, since it is smaller than the sum of its proper divisors (2663066835).

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

2156411565 is a wasteful number, since it uses less digits than its factorization.

2156411565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69184 (or 69175 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 2156411565 is about 46437.1786933703. The cubic root of 2156411565 is about 1291.9445793865.

The spelling of 2156411565 in words is "two billion, one hundred fifty-six million, four hundred eleven thousand, five hundred sixty-five".