56842521781 has 8 divisors (see below), whose sum is σ = 57011440320. Its totient is φ = 56673853152.

The previous prime is 56842521709. The next prime is 56842521851. The reversal of 56842521781 is 18712524865.

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 56842521781 - 2⁹ = 56842521269 is a prime.

It is a super-2 number, since 2×56842521781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56840521781) 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, 398121 + ... + 521713.

It is an arithmetic number, because the mean of its divisors is an integer number (7126430040).

Almost surely, 2^56842521781 is an apocalyptic number.

It is an amenable number.

56842521781 is a deficient number, since it is larger than the sum of its proper divisors (168918539).

56842521781 is a wasteful number, since it uses less digits than its factorization.

56842521781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124955.

The product of its digits is 1075200, while the sum is 49.

The spelling of 56842521781 in words is "fifty-six billion, eight hundred forty-two million, five hundred twenty-one thousand, seven hundred eighty-one".