2156965272 has 192 divisors, whose sum is σ = 7666963200. Its totient is φ = 530737920.

The previous prime is 2156965259. The next prime is 2156965289. The reversal of 2156965272 is 2725696512.

2156965272 is a `hidden beast` number, since 2 + 1 + 569 + 65 + 27 + 2 = 666.

It is a super-2 number, since 2×2156965272² = 9304998369228067968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95098 + ... + 115574.

It is an arithmetic number, because the mean of its divisors is an integer number (39932100).

Almost surely, 2^2156965272 is an apocalyptic number.

2156965272 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156965272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3833481600).

2156965272 is an abundant number, since it is smaller than the sum of its proper divisors (5509997928).

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

2156965272 is a wasteful number, since it uses less digits than its factorization.

2156965272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20526 (or 20519 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 2156965272 is about 46443.1402039096. The cubic root of 2156965272 is about 1292.0551484989.

The spelling of 2156965272 in words is "two billion, one hundred fifty-six million, nine hundred sixty-five thousand, two hundred seventy-two".