660165561066 has 32 divisors (see below), whose sum is σ = 1525088357568. Its totient is φ = 188282512640.

The previous prime is 660165561053. The next prime is 660165561113.

660165561066 is nontrivially palindromic in base 10.

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, 294190305 + ... + 294192548.

It is an arithmetic number, because the mean of its divisors is an integer number (47659011174).

Almost surely, 2^660165561066 is an apocalyptic number.

660165561066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

660165561066 is an abundant number, since it is smaller than the sum of its proper divisors (864922796502).

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

660165561066 is a wasteful number, since it uses less digits than its factorization.

660165561066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588382886.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 660165561066 in words is "six hundred sixty billion, one hundred sixty-five million, five hundred sixty-one thousand, sixty-six".