56783553721 has 2 divisors, whose sum is σ = 56783553722. Its totient is φ = 56783553720.

The previous prime is 56783553707. The next prime is 56783553769. The reversal of 56783553721 is 12735538765.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53333283600 + 3450270121 = 230940^2 + 58739^2 .

It is a cyclic number.

It is not a de Polignac number, because 56783553721 - 2⁵ = 56783553689 is a prime.

It is not a weakly prime, because it can be changed into another prime (56783533721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28391776860 + 28391776861.

It is an arithmetic number, because the mean of its divisors is an integer number (28391776861).

Almost surely, 2^56783553721 is an apocalyptic number.

It is an amenable number.

56783553721 is a deficient number, since it is larger than the sum of its proper divisors (1).

56783553721 is an equidigital number, since it uses as much as digits as its factorization.

56783553721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292000, while the sum is 52.

The spelling of 56783553721 in words is "fifty-six billion, seven hundred eighty-three million, five hundred fifty-three thousand, seven hundred twenty-one".