56663906773 has 4 divisors (see below), whose sum is σ = 57440124748. Its totient is φ = 55887688800.

The previous prime is 56663906759. The next prime is 56663906807. The reversal of 56663906773 is 37760936665.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34357588164 + 22306318609 = 185358^2 + 149353^2 .

It is a cyclic number.

It is not a de Polignac number, because 56663906773 - 2²¹ = 56661809621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56663906713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388108878 + ... + 388109023.

It is an arithmetic number, because the mean of its divisors is an integer number (14360031187).

Almost surely, 2^56663906773 is an apocalyptic number.

It is an amenable number.

56663906773 is a deficient number, since it is larger than the sum of its proper divisors (776217975).

56663906773 is an equidigital number, since it uses as much as digits as its factorization.

56663906773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776217974.

The product of its (nonzero) digits is 25719120, while the sum is 58.

The spelling of 56663906773 in words is "fifty-six billion, six hundred sixty-three million, nine hundred six thousand, seven hundred seventy-three".