12641215549 has 2 divisors, whose sum is σ = 12641215550. Its totient is φ = 12641215548.

The previous prime is 12641215429. The next prime is 12641215597. The reversal of 12641215549 is 94551214621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12640504900 + 710649 = 112430^2 + 843^2 .

It is a cyclic number.

It is not a de Polignac number, because 12641215549 - 2²¹ = 12639118397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12641215849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320607774 + 6320607775.

It is an arithmetic number, because the mean of its divisors is an integer number (6320607775).

Almost surely, 2^12641215549 is an apocalyptic number.

It is an amenable number.

12641215549 is a deficient number, since it is larger than the sum of its proper divisors (1).

12641215549 is an equidigital number, since it uses as much as digits as its factorization.

12641215549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 40.

The spelling of 12641215549 in words is "twelve billion, six hundred forty-one million, two hundred fifteen thousand, five hundred forty-nine".