12691284195018 has 64 divisors (see below), whose sum is σ = 29844666536832. Its totient is φ = 3547082638080.

The previous prime is 12691284195017. The next prime is 12691284195089. The reversal of 12691284195018 is 81059148219621.

It is a happy number.

It is a super-2 number, since 2×12691284195018² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12691284195011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5056405 + ... + 7137912.

It is an arithmetic number, because the mean of its divisors is an integer number (466322914638).

Almost surely, 2^{12691284195018} is an apocalyptic number.

12691284195018 is an abundant number, since it is smaller than the sum of its proper divisors (17153382341814).

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

12691284195018 is a wasteful number, since it uses less digits than its factorization.

12691284195018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12195559.

The product of its (nonzero) digits is 2488320, while the sum is 57.

The spelling of 12691284195018 in words is "twelve trillion, six hundred ninety-one billion, two hundred eighty-four million, one hundred ninety-five thousand, eighteen".