56753016721 has 2 divisors, whose sum is σ = 56753016722. Its totient is φ = 56753016720.

The previous prime is 56753016713. The next prime is 56753016751. The reversal of 56753016721 is 12761035765.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43833284496 + 12919732225 = 209364^2 + 113665^2 .

It is a cyclic number.

It is not a de Polignac number, because 56753016721 - 2³ = 56753016713 is a prime.

It is not a weakly prime, because it can be changed into another prime (56753016751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28376508360 + 28376508361.

It is an arithmetic number, because the mean of its divisors is an integer number (28376508361).

Almost surely, 2^56753016721 is an apocalyptic number.

It is an amenable number.

56753016721 is a deficient number, since it is larger than the sum of its proper divisors (1).

56753016721 is an equidigital number, since it uses as much as digits as its factorization.

56753016721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 43.

The spelling of 56753016721 in words is "fifty-six billion, seven hundred fifty-three million, sixteen thousand, seven hundred twenty-one".