16618979 has 16 divisors (see below), whose sum is σ = 19121760. Its totient is φ = 14307840.

The previous prime is 16618969. The next prime is 16618997. The reversal of 16618979 is 97981661.

It is a cyclic number.

It is not a de Polignac number, because 16618979 - 2¹⁶ = 16553443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16618969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30449 + ... + 30989.

It is an arithmetic number, because the mean of its divisors is an integer number (1195110).

Almost surely, 2^16618979 is an apocalyptic number.

16618979 is a deficient number, since it is larger than the sum of its proper divisors (2502781).

16618979 is a wasteful number, since it uses less digits than its factorization.

16618979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710.

The product of its digits is 163296, while the sum is 47.

The square root of 16618979 is about 4076.6381983198. The cubic root of 16618979 is about 255.1926213460.

The spelling of 16618979 in words is "sixteen million, six hundred eighteen thousand, nine hundred seventy-nine".