163604665 has 16 divisors (see below), whose sum is σ = 224589312. Its totient is φ = 112077504.

The previous prime is 163604659. The next prime is 163604669. The reversal of 163604665 is 566406361.

It is not a de Polignac number, because 163604665 - 2³ = 163604657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163604669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54432 + ... + 57358.

It is an arithmetic number, because the mean of its divisors is an integer number (14036832).

Almost surely, 2^163604665 is an apocalyptic number.

It is an amenable number.

163604665 is a deficient number, since it is larger than the sum of its proper divisors (60984647).

163604665 is a wasteful number, since it uses less digits than its factorization.

163604665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 163604665 is about 12790.8039231316. The cubic root of 163604665 is about 546.9301870402.

It can be divided in two parts, 16360 and 4665, that added together give a square (21025 = 145²).

The spelling of 163604665 in words is "one hundred sixty-three million, six hundred four thousand, six hundred sixty-five".