165666065660 has 48 divisors (see below), whose sum is σ = 363063387456. Its totient is φ = 63378534912.

The previous prime is 165666065641. The next prime is 165666065671. The reversal of 165666065660 is 66560666561.

It is a super-2 number, since 2×165666065660² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 7603502 + ... + 7625258.

It is an arithmetic number, because the mean of its divisors is an integer number (7563820572).

Almost surely, 2^165666065660 is an apocalyptic number.

165666065660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165666065660 is an abundant number, since it is smaller than the sum of its proper divisors (197397321796).

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

165666065660 is a wasteful number, since it uses less digits than its factorization.

165666065660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38342 (or 38340 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 165666065660 in words is "one hundred sixty-five billion, six hundred sixty-six million, sixty-five thousand, six hundred sixty".