2156518170 has 48 divisors (see below), whose sum is σ = 5936771880. Its totient is φ = 541243392.

The previous prime is 2156518159. The next prime is 2156518171. The reversal of 2156518170 is 718156512.

2156518170 is a `hidden beast` number, since 21 + 56 + 518 + 1 + 70 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2156394969 + 123201 = 46437^2 + 351^2 .

It is not an unprimeable number, because it can be changed into a prime (2156518171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 703215 + ... + 706274.

Almost surely, 2^2156518170 is an apocalyptic number.

2156518170 is an abundant number, since it is smaller than the sum of its proper divisors (3780253710).

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

2156518170 is a wasteful number, since it uses less digits than its factorization.

2156518170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409519 (or 1409516 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The square root of 2156518170 is about 46438.3265202354. The cubic root of 2156518170 is about 1291.9658686872.

The spelling of 2156518170 in words is "two billion, one hundred fifty-six million, five hundred eighteen thousand, one hundred seventy".