163945904 has 20 divisors (see below), whose sum is σ = 319552464. Its totient is φ = 81480768.

The previous prime is 163945897. The next prime is 163945933. The reversal of 163945904 is 409549361.

163945904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28007 + ... + 33350.

Almost surely, 2^163945904 is an apocalyptic number.

It is an amenable number.

163945904 is a deficient number, since it is larger than the sum of its proper divisors (155606560).

163945904 is a wasteful number, since it uses less digits than its factorization.

163945904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61532 (or 61526 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 163945904 is about 12804.1362067107. The cubic root of 163945904 is about 547.3101768219.

The spelling of 163945904 in words is "one hundred sixty-three million, nine hundred forty-five thousand, nine hundred four".