56449522581 has 4 divisors (see below), whose sum is σ = 75266030112. Its totient is φ = 37633015052.

The previous prime is 56449522579. The next prime is 56449522583. The reversal of 56449522581 is 18522594465.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (56449522579) and next prime (56449522583).

It is a cyclic number.

It is not a de Polignac number, because 56449522581 - 2¹ = 56449522579 is a prime.

It is a super-2 number, since 2×56449522581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56449522583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9408253761 + ... + 9408253766.

It is an arithmetic number, because the mean of its divisors is an integer number (18816507528).

Almost surely, 2^56449522581 is an apocalyptic number.

It is an amenable number.

56449522581 is a deficient number, since it is larger than the sum of its proper divisors (18816507531).

56449522581 is a wasteful number, since it uses less digits than its factorization.

56449522581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18816507530.

The product of its digits is 3456000, while the sum is 51.

The spelling of 56449522581 in words is "fifty-six billion, four hundred forty-nine million, five hundred twenty-two thousand, five hundred eighty-one".