56521702170131 has 16 divisors (see below), whose sum is σ = 62178812587008. Its totient is φ = 50952766195200.

The previous prime is 56521702170029. The next prime is 56521702170161. The reversal of 56521702170131 is 13107120712565.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56521702170131 is a prime.

It is a super-2 number, since 2×56521702170131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56521702170161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42142811 + ... + 43463316.

It is an arithmetic number, because the mean of its divisors is an integer number (3886175786688).

Almost surely, 2^{56521702170131} is an apocalyptic number.

56521702170131 is a deficient number, since it is larger than the sum of its proper divisors (5657110416877).

56521702170131 is a wasteful number, since it uses less digits than its factorization.

56521702170131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85606642.

The product of its (nonzero) digits is 88200, while the sum is 41.

Adding to 56521702170131 its reverse (13107120712565), we get a palindrome (69628822882696).

The spelling of 56521702170131 in words is "fifty-six trillion, five hundred twenty-one billion, seven hundred two million, one hundred seventy thousand, one hundred thirty-one".