15666006 has 8 divisors (see below), whose sum is σ = 31332024. Its totient is φ = 5222000.

The previous prime is 15665999. The next prime is 15666023. The reversal of 15666006 is 60066651.

It is a sphenic number, since it is the product of 3 distinct primes.

15666006 is an admirable number.

It is a congruent number.

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, 1305495 + ... + 1305506.

It is an arithmetic number, because the mean of its divisors is an integer number (3916503).

Almost surely, 2^15666006 is an apocalyptic number.

15666006 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

15666006 is a wasteful number, since it uses less digits than its factorization.

15666006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611006.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 15666006 is about 3958.0305708774. The cubic root of 15666006 is about 250.2185076287.

The spelling of 15666006 in words is "fifteen million, six hundred sixty-six thousand, six".