16660642139 has 8 divisors (see below), whose sum is σ = 17236918272. Its totient is φ = 16086793320.

The previous prime is 16660642123. The next prime is 16660642151. The reversal of 16660642139 is 93124606661.

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

It is a cyclic number.

It is not a de Polignac number, because 16660642139 - 2⁴ = 16660642123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16660642139.

It is not an unprimeable number, because it can be changed into a prime (16660642169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 592859 + ... + 620324.

It is an arithmetic number, because the mean of its divisors is an integer number (2154614784).

Almost surely, 2^16660642139 is an apocalyptic number.

16660642139 is a deficient number, since it is larger than the sum of its proper divisors (576276133).

16660642139 is a wasteful number, since it uses less digits than its factorization.

16660642139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213657.

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 16660642139 in words is "sixteen billion, six hundred sixty million, six hundred forty-two thousand, one hundred thirty-nine".