56615056649 has 4 divisors (see below), whose sum is σ = 56616111636. Its totient is φ = 56614001664.

The previous prime is 56615056639. The next prime is 56615056661. The reversal of 56615056649 is 94665051665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94665051665 = 5 ⋅18933010333.

It can be written as a sum of positive squares in 2 ways, for example, as 14535919225 + 42079137424 = 120565^2 + 205132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56615056649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 56615056649.

It is not an unprimeable number, because it can be changed into a prime (56615056639) 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, 442424 + ... + 555849.

It is an arithmetic number, because the mean of its divisors is an integer number (14154027909).

Almost surely, 2^56615056649 is an apocalyptic number.

It is an amenable number.

56615056649 is a deficient number, since it is larger than the sum of its proper divisors (1054987).

56615056649 is an equidigital number, since it uses as much as digits as its factorization.

56615056649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054986.

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 56615056649 in words is "fifty-six billion, six hundred fifteen million, fifty-six thousand, six hundred forty-nine".