12641640587 has 2 divisors, whose sum is σ = 12641640588. Its totient is φ = 12641640586.

The previous prime is 12641640569. The next prime is 12641640617. The reversal of 12641640587 is 78504614621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12641640587 is a prime.

It is a super-2 number, since 2×12641640587² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12641640547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320820293 + 6320820294.

It is an arithmetic number, because the mean of its divisors is an integer number (6320820294).

Almost surely, 2^12641640587 is an apocalyptic number.

12641640587 is a deficient number, since it is larger than the sum of its proper divisors (1).

12641640587 is an equidigital number, since it uses as much as digits as its factorization.

12641640587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 12641640587 in words is "twelve billion, six hundred forty-one million, six hundred forty thousand, five hundred eighty-seven".