12691284195051 has 90 divisors (see below), whose sum is σ = 23333256828492. Its totient is φ = 6591972638160.

The previous prime is 12691284195017. The next prime is 12691284195089. The reversal of 12691284195051 is 15059148219621.

12691284195051 is a `hidden beast` number, since 1 + 2 + 6 + 9 + 128 + 4 + 1 + 9 + 505 + 1 = 666.

It is not a de Polignac number, because 12691284195051 - 2¹⁷ = 12691284063979 is a prime.

It is a super-2 number, since 2×12691284195051² (a number of 27 digits) contains 22 as substring.

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 89 ways as a sum of consecutive naturals, for example, 1736862940 + ... + 1736870246.

Almost surely, 2^{12691284195051} is an apocalyptic number.

12691284195051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12691284195051 is a deficient number, since it is larger than the sum of its proper divisors (10641972633441).

12691284195051 is an frugal number, since it uses more digits than its factorization.

12691284195051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14659 (or 7328 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 54.

The spelling of 12691284195051 in words is "twelve trillion, six hundred ninety-one billion, two hundred eighty-four million, one hundred ninety-five thousand, fifty-one".