56156022215521 has 4 divisors (see below), whose sum is σ = 56156519905200. Its totient is φ = 56155524525844.

The previous prime is 56156022215519. The next prime is 56156022215639. The reversal of 56156022215521 is 12551222065165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56156022215521 - 2¹ = 56156022215519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56156022215221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248675551 + ... + 248901268.

It is an arithmetic number, because the mean of its divisors is an integer number (14039129976300).

Almost surely, 2^{56156022215521} is an apocalyptic number.

It is an amenable number.

56156022215521 is a deficient number, since it is larger than the sum of its proper divisors (497689679).

56156022215521 is a wasteful number, since it uses less digits than its factorization.

56156022215521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497689678.

The product of its (nonzero) digits is 360000, while the sum is 43.

The spelling of 56156022215521 in words is "fifty-six trillion, one hundred fifty-six billion, twenty-two million, two hundred fifteen thousand, five hundred twenty-one".