666605151 has 12 divisors (see below), whose sum is σ = 972408840. Its totient is φ = 440002800.

The previous prime is 666605141. The next prime is 666605153. The reversal of 666605151 is 151506666.

It is not a de Polignac number, because 666605151 - 2²¹ = 664507999 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666605153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 365761 + ... + 367578.

It is an arithmetic number, because the mean of its divisors is an integer number (81034070).

Almost surely, 2^666605151 is an apocalyptic number.

666605151 is a deficient number, since it is larger than the sum of its proper divisors (305803689).

666605151 is a wasteful number, since it uses less digits than its factorization.

666605151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733446 (or 733443 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 666605151 is about 25818.6977014721. The cubic root of 666605151 is about 873.5535944675.

The spelling of 666605151 in words is "six hundred sixty-six million, six hundred five thousand, one hundred fifty-one".