16666582509 has 12 divisors (see below), whose sum is σ = 24083467200. Its totient is φ = 11106663624.

The previous prime is 16666582453. The next prime is 16666582511. The reversal of 16666582509 is 90528566661.

It is not a de Polignac number, because 16666582509 - 2⁷ = 16666582381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666582409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 341829 + ... + 387530.

It is an arithmetic number, because the mean of its divisors is an integer number (2006955600).

Almost surely, 2^16666582509 is an apocalyptic number.

It is an amenable number.

16666582509 is a deficient number, since it is larger than the sum of its proper divisors (7416884691).

16666582509 is a wasteful number, since it uses less digits than its factorization.

16666582509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731904 (or 731901 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 16666582509 in words is "sixteen billion, six hundred sixty-six million, five hundred eighty-two thousand, five hundred nine".