165120066 has 32 divisors (see below), whose sum is σ = 369838080. Its totient is φ = 54604368.

The previous prime is 165120049. The next prime is 165120077. The reversal of 165120066 is 660021561.

It is a happy number.

165120066 is a `hidden beast` number, since 1 + 651 + 2 + 0 + 0 + 6 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5181 + ... + 18896.

It is an arithmetic number, because the mean of its divisors is an integer number (11557440).

Almost surely, 2^165120066 is an apocalyptic number.

165120066 is an abundant number, since it is smaller than the sum of its proper divisors (204718014).

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

165120066 is a wasteful number, since it uses less digits than its factorization.

165120066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24215 (or 24209 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 165120066 is about 12849.9052914798. The cubic root of 165120066 is about 548.6136611250.

The spelling of 165120066 in words is "one hundred sixty-five million, one hundred twenty thousand, sixty-six".