16660779 has 4 divisors (see below), whose sum is σ = 22214376. Its totient is φ = 11107184.

The previous prime is 16660769. The next prime is 16660793. The reversal of 16660779 is 97706661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16660779 - 2¹² = 16656683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16660779.

It is not an unprimeable number, because it can be changed into a prime (16660729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776794 + ... + 2776799.

It is an arithmetic number, because the mean of its divisors is an integer number (5553594).

Almost surely, 2^16660779 is an apocalyptic number.

16660779 is a deficient number, since it is larger than the sum of its proper divisors (5553597).

16660779 is an equidigital number, since it uses as much as digits as its factorization.

16660779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5553596.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 16660779 is about 4081.7617519890. The cubic root of 16660779 is about 255.4063954253.

The spelling of 16660779 in words is "sixteen million, six hundred sixty thousand, seven hundred seventy-nine".