12645500618887 has 2 divisors, whose sum is σ = 12645500618888. Its totient is φ = 12645500618886.

The previous prime is 12645500618857. The next prime is 12645500618897. The reversal of 12645500618887 is 78881600554621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12645500618887 is a prime.

It is a super-2 number, since 2×12645500618887² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12645500618827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6322750309443 + 6322750309444.

It is an arithmetic number, because the mean of its divisors is an integer number (6322750309444).

Almost surely, 2^{12645500618887} is an apocalyptic number.

12645500618887 is a deficient number, since it is larger than the sum of its proper divisors (1).

12645500618887 is an equidigital number, since it uses as much as digits as its factorization.

12645500618887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25804800, while the sum is 61.

The spelling of 12645500618887 in words is "twelve trillion, six hundred forty-five billion, five hundred million, six hundred eighteen thousand, eight hundred eighty-seven".