12856867519 has 2 divisors, whose sum is σ = 12856867520. Its totient is φ = 12856867518.

The previous prime is 12856867501. The next prime is 12856867523. The reversal of 12856867519 is 91576865821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12856867519 - 2⁵ = 12856867487 is a prime.

It is a super-2 number, since 2×12856867519² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12856867549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6428433759 + 6428433760.

It is an arithmetic number, because the mean of its divisors is an integer number (6428433760).

Almost surely, 2^12856867519 is an apocalyptic number.

12856867519 is a deficient number, since it is larger than the sum of its proper divisors (1).

12856867519 is an equidigital number, since it uses as much as digits as its factorization.

12856867519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7257600, while the sum is 58.

The spelling of 12856867519 in words is "twelve billion, eight hundred fifty-six million, eight hundred sixty-seven thousand, five hundred nineteen".