2120956656 has 80 divisors (see below), whose sum is σ = 6743568384. Its totient is φ = 559372032.

The previous prime is 2120956637. The next prime is 2120956697. The reversal of 2120956656 is 6566590212.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238416 + ... + 247151.

Almost surely, 2^2120956656 is an apocalyptic number.

2120956656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2120956656 is an abundant number, since it is smaller than the sum of its proper divisors (4622611728).

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

2120956656 is a wasteful number, since it uses less digits than its factorization.

2120956656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485598 (or 485592 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 2120956656 is about 46053.8451814829. The cubic root of 2120956656 is about 1284.8248598781.

The spelling of 2120956656 in words is "two billion, one hundred twenty million, nine hundred fifty-six thousand, six hundred fifty-six".