56656505569 has 4 divisors (see below), whose sum is σ = 56659304196. Its totient is φ = 56653706944.

The previous prime is 56656505539. The next prime is 56656505627. The reversal of 56656505569 is 96550565665.

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 21345210000 + 35311295569 = 146100^2 + 187913^2 .

It is a cyclic number.

It is not a de Polignac number, because 56656505569 - 2¹⁷ = 56656374497 is a prime.

It is a super-2 number, since 2×56656505569² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56656505539) 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, 1368724 + ... + 1409509.

It is an arithmetic number, because the mean of its divisors is an integer number (14164826049).

Almost surely, 2^56656505569 is an apocalyptic number.

It is an amenable number.

56656505569 is a deficient number, since it is larger than the sum of its proper divisors (2798627).

56656505569 is a wasteful number, since it uses less digits than its factorization.

56656505569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798626.

The product of its (nonzero) digits is 36450000, while the sum is 58.

The spelling of 56656505569 in words is "fifty-six billion, six hundred fifty-six million, five hundred five thousand, five hundred sixty-nine".