56515500561 has 8 divisors (see below), whose sum is σ = 81150462400. Its totient is φ = 34778769552.

The previous prime is 56515500539. The next prime is 56515500583. The reversal of 56515500561 is 16500551565.

It is an interprime number because it is at equal distance from previous prime (56515500539) and next prime (56515500583).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56515500561 - 2¹⁴ = 56515484177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1449115399 = 56515500561 / (5 + 6 + 5 + 1 + 5 + 5 + 0 + 0 + 5 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56515500521) 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, 724557661 + ... + 724557738.

It is an arithmetic number, because the mean of its divisors is an integer number (10143807800).

Almost surely, 2^56515500561 is an apocalyptic number.

It is an amenable number.

56515500561 is a deficient number, since it is larger than the sum of its proper divisors (24634961839).

56515500561 is a wasteful number, since it uses less digits than its factorization.

56515500561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449115415.

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 56515500561 in words is "fifty-six billion, five hundred fifteen million, five hundred thousand, five hundred sixty-one".