56321256633681 has 64 divisors (see below), whose sum is σ = 81572421772800. Its totient is φ = 34360317573120.

The previous prime is 56321256633671. The next prime is 56321256633703. The reversal of 56321256633681 is 18633665212365.

It is not a de Polignac number, because 56321256633681 - 2¹⁸ = 56321256371537 is a prime.

It is a super-2 number, since 2×56321256633681² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56321256633601) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2936294911 + ... + 2936314091.

It is an arithmetic number, because the mean of its divisors is an integer number (1274569090200).

Almost surely, 2^{56321256633681} is an apocalyptic number.

It is an amenable number.

56321256633681 is a deficient number, since it is larger than the sum of its proper divisors (25251165139119).

56321256633681 is a wasteful number, since it uses less digits than its factorization.

56321256633681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20746.

The product of its digits is 27993600, while the sum is 57.

The spelling of 56321256633681 in words is "fifty-six trillion, three hundred twenty-one billion, two hundred fifty-six million, six hundred thirty-three thousand, six hundred eighty-one".