2156681296 has 240 divisors, whose sum is σ = 5642638848. Its totient is φ = 787987200.

The previous prime is 2156681257. The next prime is 2156681311. The reversal of 2156681296 is 6921866512.

It is a Harshad number since it is a multiple of its sum of digits (46).

Its product of digits (311040) is a multiple of the sum of its prime factors (270).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16463151 + ... + 16463281.

Almost surely, 2^2156681296 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 2156681296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2821319424).

2156681296 is an abundant number, since it is smaller than the sum of its proper divisors (3485957552).

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

2156681296 is a wasteful number, since it uses less digits than its factorization.

2156681296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270 (or 257 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 2156681296 is about 46440.0828595299. The cubic root of 2156681296 is about 1291.9984440230.

The spelling of 2156681296 in words is "two billion, one hundred fifty-six million, six hundred eighty-one thousand, two hundred ninety-six".