163640165 has 24 divisors (see below), whose sum is σ = 219529728. Its totient is φ = 116925120.

The previous prime is 163640153. The next prime is 163640173. The reversal of 163640165 is 561046361.

163640165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 163640165 - 2¹⁴ = 163623781 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23072 + ... + 29318.

It is an arithmetic number, because the mean of its divisors is an integer number (9147072).

Almost surely, 2^163640165 is an apocalyptic number.

It is an amenable number.

163640165 is a deficient number, since it is larger than the sum of its proper divisors (55889563).

163640165 is a wasteful number, since it uses less digits than its factorization.

163640165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6309 (or 6296 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 163640165 is about 12792.1915636063. The cubic root of 163640165 is about 546.9697429976.

The spelling of 163640165 in words is "one hundred sixty-three million, six hundred forty thousand, one hundred sixty-five".