6625591779 has 4 divisors (see below), whose sum is σ = 8834122376. Its totient is φ = 4417061184.

The previous prime is 6625591771. The next prime is 6625591801. The reversal of 6625591779 is 9771955266.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6625591779 - 2³ = 6625591771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6625591771) 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, 1104265294 + ... + 1104265299.

It is an arithmetic number, because the mean of its divisors is an integer number (2208530594).

Almost surely, 2^6625591779 is an apocalyptic number.

6625591779 is a deficient number, since it is larger than the sum of its proper divisors (2208530597).

6625591779 is a wasteful number, since it uses less digits than its factorization.

6625591779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208530596.

The product of its digits is 7144200, while the sum is 57.

The square root of 6625591779 is about 81397.7381688214. The cubic root of 6625591779 is about 1878.1987972324.

The spelling of 6625591779 in words is "six billion, six hundred twenty-five million, five hundred ninety-one thousand, seven hundred seventy-nine".