165600666 has 64 divisors (see below), whose sum is σ = 458818560. Its totient is φ = 43012080.

The previous prime is 165600661. The next prime is 165600679. The reversal of 165600666 is 666006561.

It is a self number, because there is not a number n which added to its sum of digits gives 165600666.

It is not an unprimeable number, because it can be changed into a prime (165600661) 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, 15756 + ... + 24071.

It is an arithmetic number, because the mean of its divisors is an integer number (7169040).

Almost surely, 2^165600666 is an apocalyptic number.

165600666 is an abundant number, since it is smaller than the sum of its proper divisors (293217894).

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

165600666 is a wasteful number, since it uses less digits than its factorization.

165600666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39856 (or 39850 counting only the distinct ones).

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

The square root of 165600666 is about 12868.5922306987. The cubic root of 165600666 is about 549.1454122267.

The spelling of 165600666 in words is "one hundred sixty-five million, six hundred thousand, six hundred sixty-six".