206180831385 has 24 divisors (see below), whose sum is σ = 359194235400. Its totient is φ = 109404916992.

The previous prime is 206180831377. The next prime is 206180831401. The reversal of 206180831385 is 583138081602.

206180831385 is a `hidden beast` number, since 20 + 618 + 0 + 8 + 3 + 1 + 3 + 8 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 82059904521 + 124120926864 = 286461^2 + 352308^2 .

It is not a de Polignac number, because 206180831385 - 2³ = 206180831377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 206180831385.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11620060 + ... + 11637789.

It is an arithmetic number, because the mean of its divisors is an integer number (14966426475).

Almost surely, 2^206180831385 is an apocalyptic number.

It is an amenable number.

206180831385 is a deficient number, since it is larger than the sum of its proper divisors (153013404015).

206180831385 is a wasteful number, since it uses less digits than its factorization.

206180831385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23258057 (or 23258054 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 206180831385 in words is "two hundred six billion, one hundred eighty million, eight hundred thirty-one thousand, three hundred eighty-five".