12691347133338 has 12 divisors (see below), whose sum is σ = 27497918788938. Its totient is φ = 4230449044440.

The previous prime is 12691347133337. The next prime is 12691347133391. The reversal of 12691347133338 is 83333174319621.

12691347133338 is a `hidden beast` number, since 1 + 26 + 91 + 3 + 471 + 3 + 33 + 38 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12400067805129 + 291279328209 = 3521373^2 + 539703^2 .

It is a super-2 number, since 2×12691347133338² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12691347133337) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 352537420353 + ... + 352537420388.

Almost surely, 2^{12691347133338} is an apocalyptic number.

12691347133338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12691347133338 is an abundant number, since it is smaller than the sum of its proper divisors (14806571655600).

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

12691347133338 is a wasteful number, since it uses less digits than its factorization.

12691347133338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705074840749 (or 705074840746 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 54.

The spelling of 12691347133338 in words is "twelve trillion, six hundred ninety-one billion, three hundred forty-seven million, one hundred thirty-three thousand, three hundred thirty-eight".