15996666 has 32 divisors (see below), whose sum is σ = 36864000. Its totient is φ = 4532976.

The previous prime is 15996649. The next prime is 15996667. The reversal of 15996666 is 66669951.

It is not an unprimeable number, because it can be changed into a prime (15996667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3835 + ... + 6833.

It is an arithmetic number, because the mean of its divisors is an integer number (1152000).

Almost surely, 2^15996666 is an apocalyptic number.

15996666 is an abundant number, since it is smaller than the sum of its proper divisors (20867334).

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

15996666 is a wasteful number, since it uses less digits than its factorization.

15996666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138.

The product of its digits is 524880, while the sum is 48.

The square root of 15996666 is about 3999.5832282877. The cubic root of 15996666 is about 251.9667063599.

The spelling of 15996666 in words is "fifteen million, nine hundred ninety-six thousand, six hundred sixty-six".