2656247764609 has 4 divisors (see below), whose sum is σ = 2657383400880. Its totient is φ = 2655112128340.

The previous prime is 2656247764553. The next prime is 2656247764633. The reversal of 2656247764609 is 9064677426562.

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 2656247764609 - 2⁹ = 2656247764097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2656247764679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567814627 + ... + 567819304.

It is an arithmetic number, because the mean of its divisors is an integer number (664345850220).

Almost surely, 2^{2656247764609} is an apocalyptic number.

It is an amenable number.

2656247764609 is a deficient number, since it is larger than the sum of its proper divisors (1135636271).

2656247764609 is a wasteful number, since it uses less digits than its factorization.

2656247764609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135636270.

The product of its (nonzero) digits is 182891520, while the sum is 64.

The spelling of 2656247764609 in words is "two trillion, six hundred fifty-six billion, two hundred forty-seven million, seven hundred sixty-four thousand, six hundred nine".