56505505651 has 4 divisors (see below), whose sum is σ = 64577720752. Its totient is φ = 48433290552.

The previous prime is 56505505649. The next prime is 56505505663. The reversal of 56505505651 is 15650550565.

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

It is a cyclic number.

It is not a de Polignac number, because 56505505651 - 2¹ = 56505505649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56505505598 and 56505505607.

It is not an unprimeable number, because it can be changed into a prime (56505505621) 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, 4036107540 + ... + 4036107553.

It is an arithmetic number, because the mean of its divisors is an integer number (16144430188).

Almost surely, 2^56505505651 is an apocalyptic number.

56505505651 is a deficient number, since it is larger than the sum of its proper divisors (8072215101).

56505505651 is an equidigital number, since it uses as much as digits as its factorization.

56505505651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8072215100.

The product of its (nonzero) digits is 562500, while the sum is 43.

The spelling of 56505505651 in words is "fifty-six billion, five hundred five million, five hundred five thousand, six hundred fifty-one".