2156137056 has 96 divisors (see below), whose sum is σ = 6366578400. Its totient is φ = 718689024.

The previous prime is 2156137021. The next prime is 2156137073. The reversal of 2156137056 is 6507316512.

2156137056 is a `hidden beast` number, since 21 + 561 + 3 + 70 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2156137056.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54580 + ... + 85388.

It is an arithmetic number, because the mean of its divisors is an integer number (66318525).

Almost surely, 2^2156137056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156137056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3183289200).

2156137056 is an abundant number, since it is smaller than the sum of its proper divisors (4210441344).

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

2156137056 is an frugal number, since it uses more digits than its factorization.

2156137056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30840 (or 30814 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 2156137056 is about 46434.2228964801. Note that the first 3 decimals coincide. The cubic root of 2156137056 is about 1291.8897559830.

The spelling of 2156137056 in words is "two billion, one hundred fifty-six million, one hundred thirty-seven thousand, fifty-six".