6624506661 has 4 divisors (see below), whose sum is σ = 8832675552. Its totient is φ = 4416337772.

The previous prime is 6624506633. The next prime is 6624506663. The reversal of 6624506661 is 1666054266.

It is a happy number.

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 6624506661 - 2⁷ = 6624506533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6624506663) 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, 1104084441 + ... + 1104084446.

It is an arithmetic number, because the mean of its divisors is an integer number (2208168888).

Almost surely, 2^6624506661 is an apocalyptic number.

It is an amenable number.

6624506661 is a deficient number, since it is larger than the sum of its proper divisors (2208168891).

6624506661 is a wasteful number, since it uses less digits than its factorization.

6624506661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208168890.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 6624506661 is about 81391.0723666914. The cubic root of 6624506661 is about 1878.0962565254.

The spelling of 6624506661 in words is "six billion, six hundred twenty-four million, five hundred six thousand, six hundred sixty-one".