666163251 has 32 divisors (see below), whose sum is σ = 1077834240. Its totient is φ = 404157600.

The previous prime is 666163243. The next prime is 666163301. The reversal of 666163251 is 152361666.

It is not a de Polignac number, because 666163251 - 2³ = 666163243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666163051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11556 + ... + 38286.

It is an arithmetic number, because the mean of its divisors is an integer number (33682320).

Almost surely, 2^666163251 is an apocalyptic number.

666163251 is a deficient number, since it is larger than the sum of its proper divisors (411670989).

666163251 is a wasteful number, since it uses less digits than its factorization.

666163251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26824 (or 26818 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 666163251 is about 25810.1385312051. The cubic root of 666163251 is about 873.3605223198.

The spelling of 666163251 in words is "six hundred sixty-six million, one hundred sixty-three thousand, two hundred fifty-one".