2151161856 has 168 divisors, whose sum is σ = 6287140080. Its totient is φ = 708673536.

The previous prime is 2151161843. The next prime is 2151161867. The reversal of 2151161856 is 6581611512.

2151161856 is a `hidden beast` number, since 2 + 1 + 511 + 61 + 85 + 6 = 666.

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 2151161856.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12017575 + ... + 12017753.

Almost surely, 2^2151161856 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 2151161856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3143570040).

2151161856 is an abundant number, since it is smaller than the sum of its proper divisors (4135978224).

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

2151161856 is a wasteful number, since it uses less digits than its factorization.

2151161856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 347 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 2151161856 is about 46380.6194007799. The cubic root of 2151161856 is about 1290.8953294139.

The spelling of 2151161856 in words is "two billion, one hundred fifty-one million, one hundred sixty-one thousand, eight hundred fifty-six".