120165665 has 16 divisors (see below), whose sum is σ = 146717136. Its totient is φ = 94464000.

The previous prime is 120165653. The next prime is 120165679. The reversal of 120165665 is 566561021.

It can be written as a sum of positive squares in 8 ways, for example, as 4194304 + 115971361 = 2048^2 + 10769^2 .

It is not a de Polignac number, because 120165665 - 2¹⁸ = 119903521 is a prime.

It is a Duffinian 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, 145955 + ... + 146775.

It is an arithmetic number, because the mean of its divisors is an integer number (9169821).

Almost surely, 2^120165665 is an apocalyptic number.

It is an amenable number.

120165665 is a deficient number, since it is larger than the sum of its proper divisors (26551471).

120165665 is an equidigital number, since it uses as much as digits as its factorization.

120165665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 120165665 is about 10962.0100802727. The cubic root of 120165665 is about 493.4692910626.

It can be divided in two parts, 1201 and 65665, that added together give a palindrome (66866).

The spelling of 120165665 in words is "one hundred twenty million, one hundred sixty-five thousand, six hundred sixty-five".