56566335155721 has 8 divisors (see below), whose sum is σ = 75421827627840. Its totient is φ = 37710866393712.

The previous prime is 56566335155657. The next prime is 56566335155731. The reversal of 56566335155721 is 12755153366565.

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

It is not a de Polignac number, because 56566335155721 - 2⁶ = 56566335155657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56566335155731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696795 + ... + 10659183.

It is an arithmetic number, because the mean of its divisors is an integer number (9427728453480).

Almost surely, 2^{56566335155721} is an apocalyptic number.

It is an amenable number.

56566335155721 is a deficient number, since it is larger than the sum of its proper divisors (18855492472119).

56566335155721 is a wasteful number, since it uses less digits than its factorization.

56566335155721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11855055.

The product of its digits is 85050000, while the sum is 60.

The spelling of 56566335155721 in words is "fifty-six trillion, five hundred sixty-six billion, three hundred thirty-five million, one hundred fifty-five thousand, seven hundred twenty-one".