12178777775999 has 2 divisors, whose sum is σ = 12178777776000. Its totient is φ = 12178777775998.

The previous prime is 12178777775971. The next prime is 12178777776001. The reversal of 12178777775999 is 99957777787121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12178777775999 is a prime.

Together with 12178777776001, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12178777775999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12178777775699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6089388887999 + 6089388888000.

It is an arithmetic number, because the mean of its divisors is an integer number (6089388888000).

Almost surely, 2^{12178777775999} is an apocalyptic number.

12178777775999 is a deficient number, since it is larger than the sum of its proper divisors (1).

12178777775999 is an equidigital number, since it uses as much as digits as its factorization.

12178777775999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6861289680, while the sum is 86.

The spelling of 12178777775999 in words is "twelve trillion, one hundred seventy-eight billion, seven hundred seventy-seven million, seven hundred seventy-five thousand, nine hundred ninety-nine".