16685186868407 has 4 divisors (see below), whose sum is σ = 16685672205336. Its totient is φ = 16684701531480.

The previous prime is 16685186868397. The next prime is 16685186868463. The reversal of 16685186868407 is 70486868158661.

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 16685186868407 - 2¹⁶ = 16685186802871 is a prime.

It is a super-2 number, since 2×16685186868407² (a number of 27 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 (16685186865407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242616893 + ... + 242685654.

It is an arithmetic number, because the mean of its divisors is an integer number (4171418051334).

Almost surely, 2^{16685186868407} is an apocalyptic number.

16685186868407 is a deficient number, since it is larger than the sum of its proper divisors (485336929).

16685186868407 is an equidigital number, since it uses as much as digits as its factorization.

16685186868407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485336928.

The product of its (nonzero) digits is 743178240, while the sum is 74.

The spelling of 16685186868407 in words is "sixteen trillion, six hundred eighty-five billion, one hundred eighty-six million, eight hundred sixty-eight thousand, four hundred seven".