165320660720 has 40 divisors (see below), whose sum is σ = 385025450544. Its totient is φ = 66015590912.

The previous prime is 165320660707. The next prime is 165320660821. The reversal of 165320660720 is 27066023561.

165320660720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 1713269 + ... + 1807188.

Almost surely, 2^165320660720 is an apocalyptic number.

165320660720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165320660720 is an abundant number, since it is smaller than the sum of its proper divisors (219704789824).

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

165320660720 is a wasteful number, since it uses less digits than its factorization.

165320660720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3521057 (or 3521051 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 165320660720 in words is "one hundred sixty-five billion, three hundred twenty million, six hundred sixty thousand, seven hundred twenty".