188686490085 has 12 divisors (see below), whose sum is σ = 327056582892. Its totient is φ = 100632794688.

The previous prime is 188686490017. The next prime is 188686490107. The reversal of 188686490085 is 580094686881.

188686490085 is a `hidden beast` number, since 1 + 8 + 8 + 68 + 6 + 490 + 0 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 124972148196 + 63714341889 = 353514^2 + 252417^2 .

It is a de Polignac number, because none of the positive numbers 2^k-188686490085 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2096516512 + ... + 2096516601.

It is an arithmetic number, because the mean of its divisors is an integer number (27254715241).

Almost surely, 2^188686490085 is an apocalyptic number.

188686490085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

188686490085 is a deficient number, since it is larger than the sum of its proper divisors (138370092807).

188686490085 is a wasteful number, since it uses less digits than its factorization.

188686490085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193033124 (or 4193033121 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 63.

The spelling of 188686490085 in words is "one hundred eighty-eight billion, six hundred eighty-six million, four hundred ninety thousand, eighty-five".