1656621056 has 48 divisors (see below), whose sum is σ = 3426777900. Its totient is φ = 799719424.

The previous prime is 1656621013. The next prime is 1656621101. The reversal of 1656621056 is 6501266561.

It can be written as a sum of positive squares in 2 ways, for example, as 1413760000 + 242861056 = 37600^2 + 15584^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45446 + ... + 73338.

Almost surely, 2^1656621056 is an apocalyptic number.

1656621056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1656621056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1713388950).

1656621056 is an abundant number, since it is smaller than the sum of its proper divisors (1770156844).

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

1656621056 is an equidigital number, since it uses as much as digits as its factorization.

1656621056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27944 (or 27924 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 1656621056 is about 40701.6099927263. The cubic root of 1656621056 is about 1183.2442218333.

The spelling of 1656621056 in words is "one billion, six hundred fifty-six million, six hundred twenty-one thousand, fifty-six".