16661418 has 16 divisors (see below), whose sum is σ = 33869856. Its totient is φ = 5462640.

The previous prime is 16661417. The next prime is 16661419. The reversal of 16661418 is 81416661.

It is an interprime number because it is at equal distance from previous prime (16661417) and next prime (16661419).

It is not an unprimeable number, because it can be changed into a prime (16661417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22396 + ... + 23127.

It is an arithmetic number, because the mean of its divisors is an integer number (2116866).

Almost surely, 2^16661418 is an apocalyptic number.

16661418 is an abundant number, since it is smaller than the sum of its proper divisors (17208438).

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

16661418 is a wasteful number, since it uses less digits than its factorization.

16661418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45589.

The product of its digits is 6912, while the sum is 33.

The square root of 16661418 is about 4081.8400262627. The cubic root of 16661418 is about 255.4096606308.

The spelling of 16661418 in words is "sixteen million, six hundred sixty-one thousand, four hundred eighteen".