6627656657 has 4 divisors (see below), whose sum is σ = 6631909440. Its totient is φ = 6623403876.

The previous prime is 6627656653. The next prime is 6627656681. The reversal of 6627656657 is 7566567266.

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 6627656657 - 2² = 6627656653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6627656653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2124053 + ... + 2127170.

It is an arithmetic number, because the mean of its divisors is an integer number (1657977360).

Almost surely, 2^6627656657 is an apocalyptic number.

It is an amenable number.

6627656657 is a deficient number, since it is larger than the sum of its proper divisors (4252783).

6627656657 is a wasteful number, since it uses less digits than its factorization.

6627656657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4252782.

The product of its digits is 19051200, while the sum is 56.

The square root of 6627656657 is about 81410.4210589775. The cubic root of 6627656657 is about 1878.3938916827.

The spelling of 6627656657 in words is "six billion, six hundred twenty-seven million, six hundred fifty-six thousand, six hundred fifty-seven".