165120735564 has 36 divisors (see below), whose sum is σ = 418099633224. Its totient is φ = 54946472832.

The previous prime is 165120735557. The next prime is 165120735583. The reversal of 165120735564 is 465537021561.

165120735564 is a `hidden beast` number, since 1 + 6 + 5 + 1 + 20 + 73 + 556 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3885757 + ... + 3928020.

Almost surely, 2^165120735564 is an apocalyptic number.

It is an amenable number.

165120735564 is an abundant number, since it is smaller than the sum of its proper divisors (252978897660).

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

165120735564 is a wasteful number, since it uses less digits than its factorization.

165120735564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7814374 (or 7814369 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 165120735564 in words is "one hundred sixty-five billion, one hundred twenty million, seven hundred thirty-five thousand, five hundred sixty-four".