660605155 has 8 divisors (see below), whose sum is σ = 905972832. Its totient is φ = 452986368.

The previous prime is 660605147. The next prime is 660605177. The reversal of 660605155 is 551506066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660605155 - 2³ = 660605147 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 660605155.

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, 9437182 + ... + 9437251.

It is an arithmetic number, because the mean of its divisors is an integer number (113246604).

Almost surely, 2^660605155 is an apocalyptic number.

660605155 is a deficient number, since it is larger than the sum of its proper divisors (245367677).

660605155 is a wasteful number, since it uses less digits than its factorization.

660605155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18874445.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 660605155 is about 25702.2402720074. The cubic root of 660605155 is about 870.9247906103.

The spelling of 660605155 in words is "six hundred sixty million, six hundred five thousand, one hundred fifty-five".