120565665 has 112 divisors (see below), whose sum is σ = 246790656. Its totient is φ = 55987200.

The previous prime is 120565661. The next prime is 120565699. The reversal of 120565665 is 566565021.

It is a happy number.

It is not a de Polignac number, because 120565665 - 2² = 120565661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (120565661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 1242897 + ... + 1242993.

It is an arithmetic number, because the mean of its divisors is an integer number (2203488).

Almost surely, 2^120565665 is an apocalyptic number.

120565665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

120565665 is an abundant number, since it is smaller than the sum of its proper divisors (126224991).

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

120565665 is an equidigital number, since it uses as much as digits as its factorization.

120565665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 120565665 is about 10980.2397514808. The cubic root of 120565665 is about 494.0162279469.

The spelling of 120565665 in words is "one hundred twenty million, five hundred sixty-five thousand, six hundred sixty-five".