16521164 has 12 divisors (see below), whose sum is σ = 31540488. Its totient is φ = 7509600.

The previous prime is 16521157. The next prime is 16521187. The reversal of 16521164 is 46112561.

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, 187697 + ... + 187784.

It is an arithmetic number, because the mean of its divisors is an integer number (2628374).

Almost surely, 2^16521164 is an apocalyptic number.

It is an amenable number.

16521164 is a deficient number, since it is larger than the sum of its proper divisors (15019324).

16521164 is a wasteful number, since it uses less digits than its factorization.

16521164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375496 (or 375494 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 16521164 is about 4064.6234757970. The cubic root of 16521164 is about 254.6909699980.

The spelling of 16521164 in words is "sixteen million, five hundred twenty-one thousand, one hundred sixty-four".