56721706522351 has 8 divisors (see below), whose sum is σ = 64678144994064. Its totient is φ = 49278586661760.

The previous prime is 56721706522333. The next prime is 56721706522361. The reversal of 56721706522351 is 15322560712765.

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 56721706522351 - 2²⁷ = 56721572304623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56721706522361) 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, 128329652545 + ... + 128329652986.

It is an arithmetic number, because the mean of its divisors is an integer number (8084768124258).

Almost surely, 2^{56721706522351} is an apocalyptic number.

56721706522351 is a deficient number, since it is larger than the sum of its proper divisors (7956438471713).

56721706522351 is a wasteful number, since it uses less digits than its factorization.

56721706522351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256659305561.

The product of its (nonzero) digits is 5292000, while the sum is 52.

The spelling of 56721706522351 in words is "fifty-six trillion, seven hundred twenty-one billion, seven hundred six million, five hundred twenty-two thousand, three hundred fifty-one".