56556151615561 has 4 divisors (see below), whose sum is σ = 60906624816772. Its totient is φ = 52205678414352.

The previous prime is 56556151615489. The next prime is 56556151615573. The reversal of 56556151615561 is 16551615165565.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3423073524025 + 53133078091536 = 1850155^2 + 7289244^2 .

It is a cyclic number.

It is not a de Polignac number, because 56556151615561 - 2⁹ = 56556151615049 is a prime.

It is a super-2 number, since 2×56556151615561² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56556151615496 and 56556151615505.

It is not an unprimeable number, because it can be changed into a prime (56556151615591) 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, 2175236600586 + ... + 2175236600611.

It is an arithmetic number, because the mean of its divisors is an integer number (15226656204193).

Almost surely, 2^{56556151615561} is an apocalyptic number.

It is an amenable number.

56556151615561 is a deficient number, since it is larger than the sum of its proper divisors (4350473201211).

56556151615561 is a wasteful number, since it uses less digits than its factorization.

56556151615561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4350473201210.

The product of its digits is 20250000, while the sum is 58.

The spelling of 56556151615561 in words is "fifty-six trillion, five hundred fifty-six billion, one hundred fifty-one million, six hundred fifteen thousand, five hundred sixty-one".