2656640633 has 6 divisors (see below), whose sum is σ = 2723018862. Its totient is φ = 2591842880.

The previous prime is 2656640627. The next prime is 2656640659. The reversal of 2656640633 is 3360466562.

It can be written as a sum of positive squares in 3 ways, for example, as 13446889 + 2643193744 = 3667^2 + 51412^2 .

It is not a de Polignac number, because 2656640633 - 2¹² = 2656636537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2656640533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 788516 + ... + 791877.

It is an arithmetic number, because the mean of its divisors is an integer number (453836477).

Almost surely, 2^2656640633 is an apocalyptic number.

It is an amenable number.

2656640633 is a deficient number, since it is larger than the sum of its proper divisors (66378229).

2656640633 is an equidigital number, since it uses as much as digits as its factorization.

2656640633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580475 (or 1580434 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 41.

The square root of 2656640633 is about 51542.6098776537. The cubic root of 2656640633 is about 1384.9824502201.

The spelling of 2656640633 in words is "two billion, six hundred fifty-six million, six hundred forty thousand, six hundred thirty-three".