16685000431 has 4 divisors (see below), whose sum is σ = 18201818664. Its totient is φ = 15168182200.

The previous prime is 16685000429. The next prime is 16685000441. The reversal of 16685000431 is 13400058661.

It is a happy number.

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 16685000431 - 2¹ = 16685000429 is a prime.

It is a super-2 number, since 2×16685000431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16685000411) 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 3 ways as a sum of consecutive naturals, for example, 758409100 + ... + 758409121.

It is an arithmetic number, because the mean of its divisors is an integer number (4550454666).

Almost surely, 2^16685000431 is an apocalyptic number.

16685000431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16685000431 is the 69045-th centered heptagonal number.

16685000431 is a deficient number, since it is larger than the sum of its proper divisors (1516818233).

16685000431 is a wasteful number, since it uses less digits than its factorization.

16685000431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516818232.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 16685000431 in words is "sixteen billion, six hundred eighty-five million, four hundred thirty-one", and thus it is an aban number.