16660642 has 8 divisors (see below), whose sum is σ = 25031196. Its totient is φ = 8316912.

The previous prime is 16660639. The next prime is 16660681. The reversal of 16660642 is 24606661.

It can be written as a sum of positive squares in 2 ways, for example, as 16491721 + 168921 = 4061^2 + 411^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5073 + ... + 7684.

Almost surely, 2^16660642 is an apocalyptic number.

16660642 is a deficient number, since it is larger than the sum of its proper divisors (8370554).

16660642 is a wasteful number, since it uses less digits than its factorization.

16660642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13412.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 16660642 is about 4081.7449699853. The cubic root of 16660642 is about 255.4056953626.

The spelling of 16660642 in words is "sixteen million, six hundred sixty thousand, six hundred forty-two".