15990666 has 16 divisors (see below), whose sum is σ = 33664800. Its totient is φ = 5049648.

The previous prime is 15990649. The next prime is 15990679. The reversal of 15990666 is 66609951.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70021 + ... + 70248.

It is an arithmetic number, because the mean of its divisors is an integer number (2104050).

Almost surely, 2^15990666 is an apocalyptic number.

15990666 is an abundant number, since it is smaller than the sum of its proper divisors (17674134).

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

15990666 is a wasteful number, since it uses less digits than its factorization.

15990666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140293.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 15990666 is about 3998.8330797872. The cubic root of 15990666 is about 251.9352000178.

The spelling of 15990666 in words is "fifteen million, nine hundred ninety thousand, six hundred sixty-six".