12561682387 has 2 divisors, whose sum is σ = 12561682388. Its totient is φ = 12561682386.

The previous prime is 12561682333. The next prime is 12561682409. The reversal of 12561682387 is 78328616521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12561682387 - 2¹⁵ = 12561649619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12561682387.

It is not a weakly prime, because it can be changed into another prime (12561682327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6280841193 + 6280841194.

It is an arithmetic number, because the mean of its divisors is an integer number (6280841194).

Almost surely, 2^12561682387 is an apocalyptic number.

12561682387 is a deficient number, since it is larger than the sum of its proper divisors (1).

12561682387 is an equidigital number, since it uses as much as digits as its factorization.

12561682387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 49.

The spelling of 12561682387 in words is "twelve billion, five hundred sixty-one million, six hundred eighty-two thousand, three hundred eighty-seven".