6625688166 has 16 divisors (see below), whose sum is σ = 14723751600. Its totient is φ = 2208562704.

The previous prime is 6625688149. The next prime is 6625688221. The reversal of 6625688166 is 6618865266.

It is a happy number.

6625688166 is a `hidden beast` number, since 6 + 62 + 568 + 8 + 16 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 122697929 = 6625688166 / (6 + 6 + 2 + 5 + 6 + 8 + 8 + 1 + 6 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61348911 + ... + 61349018.

It is an arithmetic number, because the mean of its divisors is an integer number (920234475).

Almost surely, 2^6625688166 is an apocalyptic number.

6625688166 is an abundant number, since it is smaller than the sum of its proper divisors (8098063434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6625688166 is a wasteful number, since it uses less digits than its factorization.

6625688166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122697940 (or 122697934 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 6625688166 is about 81398.3302408594. The cubic root of 6625688166 is about 1878.2079050010.

The spelling of 6625688166 in words is "six billion, six hundred twenty-five million, six hundred eighty-eight thousand, one hundred sixty-six".