2165556012 has 24 divisors (see below), whose sum is σ = 5056682736. Its totient is φ = 721320768.

The previous prime is 2165556011. The next prime is 2165556013. The reversal of 2165556012 is 2106555612.

It is an interprime number because it is at equal distance from previous prime (2165556011) and next prime (2165556013).

It is a super-2 number, since 2×2165556012² = 9379265682218688288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2165556011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49243 + ... + 82194.

It is an arithmetic number, because the mean of its divisors is an integer number (210695114).

Almost surely, 2^2165556012 is an apocalyptic number.

It is an amenable number.

2165556012 is an abundant number, since it is smaller than the sum of its proper divisors (2891126724).

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

2165556012 is a wasteful number, since it uses less digits than its factorization.

2165556012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132817 (or 132815 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 2165556012 is about 46535.5349383673. The cubic root of 2165556012 is about 1293.7682044254.

The spelling of 2165556012 in words is "two billion, one hundred sixty-five million, five hundred fifty-six thousand, twelve".