12961597499 has 2 divisors, whose sum is σ = 12961597500. Its totient is φ = 12961597498.

The previous prime is 12961597477. The next prime is 12961597511. The reversal of 12961597499 is 99479516921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12961597499 is a prime.

It is not a weakly prime, because it can be changed into another prime (12961597469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6480798749 + 6480798750.

It is an arithmetic number, because the mean of its divisors is an integer number (6480798750).

Almost surely, 2^12961597499 is an apocalyptic number.

12961597499 is a deficient number, since it is larger than the sum of its proper divisors (1).

12961597499 is an equidigital number, since it uses as much as digits as its factorization.

12961597499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11022480, while the sum is 62.

The spelling of 12961597499 in words is "twelve billion, nine hundred sixty-one million, five hundred ninety-seven thousand, four hundred ninety-nine".