2051620656 has 40 divisors (see below), whose sum is σ = 5611788144. Its totient is φ = 643645440.

The previous prime is 2051620609. The next prime is 2051620691. The reversal of 2051620656 is 6560261502.

It is a happy number.

It is a super-2 number, since 2×2051620656² = 8418294632251740672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1256305 + ... + 1257936.

Almost surely, 2^2051620656 is an apocalyptic number.

It is an amenable number.

2051620656 is an abundant number, since it is smaller than the sum of its proper divisors (3560167488).

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

2051620656 is a wasteful number, since it uses less digits than its factorization.

2051620656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2514269 (or 2514263 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 2051620656 is about 45294.8193064063. The cubic root of 2051620656 is about 1270.6687646874.

The spelling of 2051620656 in words is "two billion, fifty-one million, six hundred twenty thousand, six hundred fifty-six".