165665076665 has 24 divisors (see below), whose sum is σ = 218601103560. Its totient is φ = 120435448320.

The previous prime is 165665076617. The next prime is 165665076671. The reversal of 165665076665 is 566670566561.

165665076665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 445589881 + 165219486784 = 21109^2 + 406472^2 .

It is not a de Polignac number, because 165665076665 - 2²⁴ = 165648299449 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1493441 + ... + 1600529.

It is an arithmetic number, because the mean of its divisors is an integer number (9108379315).

Almost surely, 2^165665076665 is an apocalyptic number.

It is an amenable number.

165665076665 is a deficient number, since it is larger than the sum of its proper divisors (52936026895).

165665076665 is a wasteful number, since it uses less digits than its factorization.

165665076665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109673 (or 109662 counting only the distinct ones).

The product of its (nonzero) digits is 40824000, while the sum is 59.

The spelling of 165665076665 in words is "one hundred sixty-five billion, six hundred sixty-five million, seventy-six thousand, six hundred sixty-five".