165120735565 has 16 divisors (see below), whose sum is σ = 213356410560. Its totient is φ = 122218973440.

The previous prime is 165120735557. The next prime is 165120735583. The reversal of 165120735565 is 565537021561.

It is a happy number.

It is not a de Polignac number, because 165120735565 - 2³ = 165120735557 is a prime.

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, 16457671 + ... + 16467700.

It is an arithmetic number, because the mean of its divisors is an integer number (13334775660).

Almost surely, 2^165120735565 is an apocalyptic number.

It is an amenable number.

165120735565 is a deficient number, since it is larger than the sum of its proper divisors (48235674995).

165120735565 is a wasteful number, since it uses less digits than its factorization.

165120735565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32925452.

The product of its (nonzero) digits is 945000, while the sum is 46.

The spelling of 165120735565 in words is "one hundred sixty-five billion, one hundred twenty million, seven hundred thirty-five thousand, five hundred sixty-five".