16681899 has 16 divisors (see below), whose sum is σ = 24028704. Its totient is φ = 10233600.

The previous prime is 16681897. The next prime is 16681901. The reversal of 16681899 is 99818661.

It is an interprime number because it is at equal distance from previous prime (16681897) and next prime (16681901).

It is not a de Polignac number, because 16681899 - 2¹ = 16681897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16681897) 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, 19909 + ... + 20729.

It is an arithmetic number, because the mean of its divisors is an integer number (1501794).

Almost surely, 2^16681899 is an apocalyptic number.

16681899 is a deficient number, since it is larger than the sum of its proper divisors (7346805).

16681899 is a wasteful number, since it uses less digits than its factorization.

16681899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358.

The product of its digits is 186624, while the sum is 48.

The square root of 16681899 is about 4084.3480507910. The cubic root of 16681899 is about 255.5142716410.

The spelling of 16681899 in words is "sixteen million, six hundred eighty-one thousand, eight hundred ninety-nine".