2156251422724 has 81 divisors (see below), whose sum is σ = 4476157289877. Its totient is φ = 906213610848.

The previous prime is 2156251422713. The next prime is 2156251422737. The reversal of 2156251422724 is 4272241526512.

The square root of 2156251422724 is 1468418.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1554435432900 + 601815989824 = 1246770^2 + 775768^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1089565167 + ... + 1089567145.

Almost surely, 2^{2156251422724} is an apocalyptic number.

2156251422724 is the 1468418-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156251422724

2156251422724 is an abundant number, since it is smaller than the sum of its proper divisors (2319905867153).

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

2156251422724 is an frugal number, since it uses more digits than its factorization.

2156251422724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082 (or 2041 counting only the distinct ones).

The product of its digits is 537600, while the sum is 43.

The spelling of 2156251422724 in words is "two trillion, one hundred fifty-six billion, two hundred fifty-one million, four hundred twenty-two thousand, seven hundred twenty-four".