12691284063979 has 2 divisors, whose sum is σ = 12691284063980. Its totient is φ = 12691284063978.

The previous prime is 12691284063917. The next prime is 12691284064031. The reversal of 12691284063979 is 97936048219621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12691284063979 - 2¹³ = 12691284055787 is a prime.

It is a super-2 number, since 2×12691284063979² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12691284061979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6345642031989 + 6345642031990.

It is an arithmetic number, because the mean of its divisors is an integer number (6345642031990).

Almost surely, 2^{12691284063979} is an apocalyptic number.

12691284063979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12691284063979 is an equidigital number, since it uses as much as digits as its factorization.

12691284063979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70543872, while the sum is 67.

The spelling of 12691284063979 in words is "twelve trillion, six hundred ninety-one billion, two hundred eighty-four million, sixty-three thousand, nine hundred seventy-nine".