666606151 has 4 divisors (see below), whose sum is σ = 689592600. Its totient is φ = 643619704.

The previous prime is 666606139. The next prime is 666606179. The reversal of 666606151 is 151606666.

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

It is a cyclic number.

It is not a de Polignac number, because 666606151 - 2⁵ = 666606119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666606151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666606121) 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, 11493181 + ... + 11493238.

It is an arithmetic number, because the mean of its divisors is an integer number (172398150).

Almost surely, 2^666606151 is an apocalyptic number.

666606151 is a deficient number, since it is larger than the sum of its proper divisors (22986449).

666606151 is a wasteful number, since it uses less digits than its factorization.

666606151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22986448.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 666606151 is about 25818.7170672751. The cubic root of 666606151 is about 873.5540312844.

The spelling of 666606151 in words is "six hundred sixty-six million, six hundred six thousand, one hundred fifty-one".