16685186868500 has 48 divisors (see below), whose sum is σ = 38584003912272. Its totient is φ = 6281482112000.

The previous prime is 16685186868481. The next prime is 16685186868509. The reversal of 16685186868500 is 586868158661.

It can be written as a sum of positive squares in 8 ways, for example, as 5523787875076 + 11161398993424 = 2350274^2 + 3340868^2 .

It is a Harshad number since it is a multiple of its sum of digits (68).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16685186868509) 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, 981473081 + ... + 981490080.

It is an arithmetic number, because the mean of its divisors is an integer number (803833414839).

Almost surely, 2^{16685186868500} is an apocalyptic number.

16685186868500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16685186868500 is an abundant number, since it is smaller than the sum of its proper divisors (21898817043772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16685186868500 is a wasteful number, since it uses less digits than its factorization.

16685186868500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962963197 (or 1962963185 counting only the distinct ones).

The product of its (nonzero) digits is 132710400, while the sum is 68.

The spelling of 16685186868500 in words is "sixteen trillion, six hundred eighty-five billion, one hundred eighty-six million, eight hundred sixty-eight thousand, five hundred".