16685007891 has 24 divisors (see below), whose sum is σ = 23140300032. Its totient is φ = 10692954000.

The previous prime is 16685007869. The next prime is 16685007893. The reversal of 16685007891 is 19870058661.

It is not a de Polignac number, because 16685007891 - 2⁶ = 16685007827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16685007893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 416170 + ... + 454496.

It is an arithmetic number, because the mean of its divisors is an integer number (964179168).

Almost surely, 2^16685007891 is an apocalyptic number.

16685007891 is a deficient number, since it is larger than the sum of its proper divisors (6455292141).

16685007891 is a wasteful number, since it uses less digits than its factorization.

16685007891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38543 (or 38512 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 51.

The spelling of 16685007891 in words is "sixteen billion, six hundred eighty-five million, seven thousand, eight hundred ninety-one".