56391722569 has 12 divisors (see below), whose sum is σ = 70644576324. Its totient is φ = 44617626144.

The previous prime is 56391722557. The next prime is 56391722593. The reversal of 56391722569 is 96522719365.

It can be written as a sum of positive squares in 2 ways, for example, as 4762794169 + 51628928400 = 69013^2 + 227220^2 .

It is not a de Polignac number, because 56391722569 - 2¹¹ = 56391720521 is a prime.

It is a super-2 number, since 2×56391722569² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56391722509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44262882 + ... + 44264155.

It is an arithmetic number, because the mean of its divisors is an integer number (5887048027).

Almost surely, 2^56391722569 is an apocalyptic number.

It is an amenable number.

56391722569 is a deficient number, since it is larger than the sum of its proper divisors (14252853755).

56391722569 is a wasteful number, since it uses less digits than its factorization.

56391722569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88527064 (or 88527057 counting only the distinct ones).

The product of its digits is 6123600, while the sum is 55.

The spelling of 56391722569 in words is "fifty-six billion, three hundred ninety-one million, seven hundred twenty-two thousand, five hundred sixty-nine".