2656661013 has 12 divisors (see below), whose sum is σ = 3941113228. Its totient is φ = 1723239360.

The previous prime is 2656660973. The next prime is 2656661017. The reversal of 2656661013 is 3101666562.

It can be written as a sum of positive squares in 2 ways, for example, as 1601840529 + 1054820484 = 40023^2 + 32478^2 .

It is not a de Polignac number, because 2656661013 - 2⁸ = 2656660757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2656661017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3988648 + ... + 3989313.

Almost surely, 2^2656661013 is an apocalyptic number.

It is an amenable number.

2656661013 is a deficient number, since it is larger than the sum of its proper divisors (1284452215).

2656661013 is a wasteful number, since it uses less digits than its factorization.

2656661013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7978004 (or 7978001 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 2656661013 is about 51542.8075777795. The cubic root of 2656661013 is about 1384.9859917692.

The spelling of 2656661013 in words is "two billion, six hundred fifty-six million, six hundred sixty-one thousand, thirteen".