165213665 has 8 divisors (see below), whose sum is σ = 199818240. Its totient is φ = 131129712.

The previous prime is 165213661. The next prime is 165213689. The reversal of 165213665 is 566312561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165213665 - 2² = 165213661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165213661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129455 + ... + 130724.

It is an arithmetic number, because the mean of its divisors is an integer number (24977280).

Almost surely, 2^165213665 is an apocalyptic number.

It is an amenable number.

165213665 is a deficient number, since it is larger than the sum of its proper divisors (34604575).

165213665 is a wasteful number, since it uses less digits than its factorization.

165213665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260311.

The product of its digits is 32400, while the sum is 35.

The square root of 165213665 is about 12853.5467867822. The cubic root of 165213665 is about 548.7173028603.

The spelling of 165213665 in words is "one hundred sixty-five million, two hundred thirteen thousand, six hundred sixty-five".