163971636 has 12 divisors (see below), whose sum is σ = 382600512. Its totient is φ = 54657208.

The previous prime is 163971629. The next prime is 163971641. The reversal of 163971636 is 636179361.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 6832140 + ... + 6832163.

It is an arithmetic number, because the mean of its divisors is an integer number (31883376).

Almost surely, 2^163971636 is an apocalyptic number.

It is an amenable number.

163971636 is an abundant number, since it is smaller than the sum of its proper divisors (218628876).

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

163971636 is a wasteful number, since it uses less digits than its factorization.

163971636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13664310 (or 13664308 counting only the distinct ones).

The product of its digits is 122472, while the sum is 42.

The square root of 163971636 is about 12805.1409988332. The cubic root of 163971636 is about 547.3388095363.

The spelling of 163971636 in words is "one hundred sixty-three million, nine hundred seventy-one thousand, six hundred thirty-six".