163665400 has 24 divisors (see below), whose sum is σ = 380522520. Its totient is φ = 65466080.

The previous prime is 163665391. The next prime is 163665419. The reversal of 163665400 is 4566361.

163665400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 408964 + ... + 409363.

It is an arithmetic number, because the mean of its divisors is an integer number (15855105).

Almost surely, 2^163665400 is an apocalyptic number.

163665400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163665400 is an abundant number, since it is smaller than the sum of its proper divisors (216857120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163665400 is a wasteful number, since it uses less digits than its factorization.

163665400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818343 (or 818334 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 163665400 is about 12793.1778694740. The cubic root of 163665400 is about 546.9978576764.

The spelling of 163665400 in words is "one hundred sixty-three million, six hundred sixty-five thousand, four hundred".