12105311265 has 12 divisors (see below), whose sum is σ = 20982539604. Its totient is φ = 6456165984.

The previous prime is 12105311249. The next prime is 12105311279. The reversal of 12105311265 is 56211350121.

12105311265 is a `hidden beast` number, since 1 + 2 + 1 + 0 + 531 + 126 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7865738721 + 4239572544 = 88689^2 + 65112^2 .

It is not a de Polignac number, because 12105311265 - 2⁴ = 12105311249 is a prime.

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, 134503414 + ... + 134503503.

It is an arithmetic number, because the mean of its divisors is an integer number (1748544967).

Almost surely, 2^12105311265 is an apocalyptic number.

12105311265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12105311265 is a deficient number, since it is larger than the sum of its proper divisors (8877228339).

12105311265 is a wasteful number, since it uses less digits than its factorization.

12105311265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269006928 (or 269006925 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

Adding to 12105311265 its reverse (56211350121), we get a palindrome (68316661386).

The spelling of 12105311265 in words is "twelve billion, one hundred five million, three hundred eleven thousand, two hundred sixty-five".