16661913 has 12 divisors (see below), whose sum is σ = 23226000. Its totient is φ = 10623976.

The previous prime is 16661903. The next prime is 16661927. The reversal of 16661913 is 31916661.

It is not a de Polignac number, because 16661913 - 2⁵ = 16661881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16661903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3663 + ... + 6836.

It is an arithmetic number, because the mean of its divisors is an integer number (1935500).

Almost surely, 2^16661913 is an apocalyptic number.

It is an amenable number.

16661913 is a deficient number, since it is larger than the sum of its proper divisors (6564087).

16661913 is a wasteful number, since it uses less digits than its factorization.

16661913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10548 (or 10525 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 16661913 is about 4081.9006602317. The cubic root of 16661913 is about 255.4121899579.

The spelling of 16661913 in words is "sixteen million, six hundred sixty-one thousand, nine hundred thirteen".