2157016956 has 12 divisors (see below), whose sum is σ = 5033039592. Its totient is φ = 719005648.

The previous prime is 2157016951. The next prime is 2157016963. The reversal of 2157016956 is 6596107512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-5 number, since 5×2157016956⁵ (a number of 48 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157016951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89875695 + ... + 89875718.

It is an arithmetic number, because the mean of its divisors is an integer number (419419966).

Almost surely, 2^2157016956 is an apocalyptic number.

It is an amenable number.

2157016956 is an abundant number, since it is smaller than the sum of its proper divisors (2876022636).

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

2157016956 is a wasteful number, since it uses less digits than its factorization.

2157016956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179751420 (or 179751418 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 42.

The square root of 2157016956 is about 46443.6966229003. The cubic root of 2157016956 is about 1292.0654682516.

The spelling of 2157016956 in words is "two billion, one hundred fifty-seven million, sixteen thousand, nine hundred fifty-six".