16661499 has 32 divisors (see below), whose sum is σ = 24883200. Its totient is φ = 9868320.

The previous prime is 16661483. The next prime is 16661509. The reversal of 16661499 is 99416661.

It is not a de Polignac number, because 16661499 - 2⁴ = 16661483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16661499.

It is not an unprimeable number, because it can be changed into a prime (16661419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92992 + ... + 93170.

It is an arithmetic number, because the mean of its divisors is an integer number (777600).

Almost surely, 2^16661499 is an apocalyptic number.

16661499 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

16661499 is a deficient number, since it is larger than the sum of its proper divisors (8221701).

16661499 is a wasteful number, since it uses less digits than its factorization.

16661499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295.

The product of its digits is 69984, while the sum is 42.

The square root of 16661499 is about 4081.8499482465. The cubic root of 16661499 is about 255.4100745241.

The spelling of 16661499 in words is "sixteen million, six hundred sixty-one thousand, four hundred ninety-nine".