56720442521 has 8 divisors (see below), whose sum is σ = 58334474880. Its totient is φ = 55110675888.

The previous prime is 56720442517. The next prime is 56720442553. The reversal of 56720442521 is 12524402765.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56720442521 - 2² = 56720442517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56720442511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1039451 + ... + 1092656.

It is an arithmetic number, because the mean of its divisors is an integer number (7291809360).

Almost surely, 2^56720442521 is an apocalyptic number.

It is an amenable number.

56720442521 is a deficient number, since it is larger than the sum of its proper divisors (1614032359).

56720442521 is a wasteful number, since it uses less digits than its factorization.

56720442521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132863.

The product of its (nonzero) digits is 134400, while the sum is 38.

The spelling of 56720442521 in words is "fifty-six billion, seven hundred twenty million, four hundred forty-two thousand, five hundred twenty-one".