16640911 has 4 divisors (see below), whose sum is σ = 19018192. Its totient is φ = 14263632.

The previous prime is 16640879. The next prime is 16640917. The reversal of 16640911 is 11904661.

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 16640911 - 2⁵ = 16640879 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 16640911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640917) 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, 1188630 + ... + 1188643.

It is an arithmetic number, because the mean of its divisors is an integer number (4754548).

Almost surely, 2^16640911 is an apocalyptic number.

16640911 is a deficient number, since it is larger than the sum of its proper divisors (2377281).

16640911 is an equidigital number, since it uses as much as digits as its factorization.

16640911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377280.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 16640911 is about 4079.3272729704. The cubic root of 16640911 is about 255.3048308929.

The spelling of 16640911 in words is "sixteen million, six hundred forty thousand, nine hundred eleven".