56554071721 has 27 divisors (see below), whose sum is σ = 67156849893. Its totient is φ = 47486100480.

The previous prime is 56554071697. The next prime is 56554071737. The reversal of 56554071721 is 12717045565.

The square root of 56554071721 is 237811.

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

56554071721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 23297443225 + 33256628496 = 152635^2 + 182364^2 .

It is not a de Polignac number, because 56554071721 - 2⁵ = 56554071689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56554071221) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 88227561 + ... + 88228201.

Almost surely, 2^56554071721 is an apocalyptic number.

56554071721 is the 237811-st square number.

56554071721 is the 118906-th centered octagonal number.

It is an amenable number.

56554071721 is a deficient number, since it is larger than the sum of its proper divisors (10602778172).

56554071721 is an frugal number, since it uses more digits than its factorization.

56554071721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 43.

The spelling of 56554071721 in words is "fifty-six billion, five hundred fifty-four million, seventy-one thousand, seven hundred twenty-one".