12505808947 has 2 divisors, whose sum is σ = 12505808948. Its totient is φ = 12505808946.

The previous prime is 12505808897. The next prime is 12505809031. The reversal of 12505808947 is 74980850521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12505808947 - 2²³ = 12497420339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12505808947.

It is not a weakly prime, because it can be changed into another prime (12505808347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6252904473 + 6252904474.

It is an arithmetic number, because the mean of its divisors is an integer number (6252904474).

Almost surely, 2^12505808947 is an apocalyptic number.

12505808947 is a deficient number, since it is larger than the sum of its proper divisors (1).

12505808947 is an equidigital number, since it uses as much as digits as its factorization.

12505808947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 12505808947 in words is "twelve billion, five hundred five million, eight hundred eight thousand, nine hundred forty-seven".