13121660205 has 160 divisors (see below), whose sum is σ = 26934716160. Its totient is φ = 6069012480.

The previous prime is 13121660197. The next prime is 13121660221. The reversal of 13121660205 is 50206612131.

13121660205 is a `hidden beast` number, since 1 + 31 + 21 + 6 + 602 + 0 + 5 = 666.

It is not a de Polignac number, because 13121660205 - 2³ = 13121660197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 4838800 + ... + 4841510.

It is an arithmetic number, because the mean of its divisors is an integer number (168341976).

Almost surely, 2^13121660205 is an apocalyptic number.

13121660205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13121660205 is an abundant number, since it is smaller than the sum of its proper divisors (13813055955).

13121660205 is a wasteful number, since it uses less digits than its factorization.

13121660205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801 (or 2792 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 13121660205 in words is "thirteen billion, one hundred twenty-one million, six hundred sixty thousand, two hundred five".