15661416 has 16 divisors (see below), whose sum is σ = 39153600. Its totient is φ = 5220464.

The previous prime is 15661391. The next prime is 15661423. The reversal of 15661416 is 61416651.

It is a super-2 number, since 2×15661416² = 490559902250112, which contains 22 as substring.

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, 326256 + ... + 326303.

It is an arithmetic number, because the mean of its divisors is an integer number (2447100).

Almost surely, 2^15661416 is an apocalyptic number.

It is an amenable number.

15661416 is an abundant number, since it is smaller than the sum of its proper divisors (23492184).

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

15661416 is a wasteful number, since it uses less digits than its factorization.

15661416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652568 (or 652564 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 15661416 is about 3957.4506945760. The cubic root of 15661416 is about 250.1940679782.

The spelling of 15661416 in words is "fifteen million, six hundred sixty-one thousand, four hundred sixteen".