56506640521 has 2 divisors, whose sum is σ = 56506640522. Its totient is φ = 56506640520.

The previous prime is 56506640513. The next prime is 56506640551. The reversal of 56506640521 is 12504660565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40386529296 + 16120111225 = 200964^2 + 126965^2 .

It is a cyclic number.

It is not a de Polignac number, because 56506640521 - 2³ = 56506640513 is a prime.

It is not a weakly prime, because it can be changed into another prime (56506640501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28253320260 + 28253320261.

It is an arithmetic number, because the mean of its divisors is an integer number (28253320261).

Almost surely, 2^56506640521 is an apocalyptic number.

It is an amenable number.

56506640521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56506640521 is an equidigital number, since it uses as much as digits as its factorization.

56506640521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 56506640521 in words is "fifty-six billion, five hundred six million, six hundred forty thousand, five hundred twenty-one".