163664406 has 24 divisors (see below), whose sum is σ = 375466104. Its totient is φ = 51345600.

The previous prime is 163664399. The next prime is 163664419. The reversal of 163664406 is 604466361.

163664406 is a `hidden beast` number, since 1 + 6 + 3 + 6 + 644 + 0 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 267120 + ... + 267731.

It is an arithmetic number, because the mean of its divisors is an integer number (15644421).

Almost surely, 2^163664406 is an apocalyptic number.

163664406 is an abundant number, since it is smaller than the sum of its proper divisors (211801698).

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

163664406 is a wasteful number, since it uses less digits than its factorization.

163664406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534876 (or 534873 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 163664406 is about 12793.1390205844. The cubic root of 163664406 is about 546.9967503013.

The spelling of 163664406 in words is "one hundred sixty-three million, six hundred sixty-four thousand, four hundred six".