56639716081 has 9 divisors (see below), whose sum is σ = 61335113931. Its totient is φ = 52279958952.

The previous prime is 56639716061. The next prime is 56639716181. The reversal of 56639716081 is 18061793665.

It is a happy number.

The square root of 56639716081 is 237991.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8378656225 + 48261059856 = 91535^2 + 219684^2 .

It is not a de Polignac number, because 56639716081 - 2⁷ = 56639715953 is a prime.

It is a super-2 number, since 2×56639716081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56639716061) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3084730 + ... + 3103036.

It is an arithmetic number, because the mean of its divisors is an integer number (6815012659).

Almost surely, 2^56639716081 is an apocalyptic number.

56639716081 is the 237991-st square number.

56639716081 is the 118996-th centered octagonal number.

It is an amenable number.

56639716081 is a deficient number, since it is larger than the sum of its proper divisors (4695397850).

56639716081 is an frugal number, since it uses more digits than its factorization.

56639716081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36640 (or 18320 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 56639716081 in words is "fifty-six billion, six hundred thirty-nine million, seven hundred sixteen thousand, eighty-one".