12508562981 has 2 divisors, whose sum is σ = 12508562982. Its totient is φ = 12508562980.

The previous prime is 12508562917. The next prime is 12508563017. The reversal of 12508562981 is 18926580521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12308793025 + 199769956 = 110945^2 + 14134^2 .

It is a cyclic number.

It is not a de Polignac number, because 12508562981 - 2⁶ = 12508562917 is a prime.

It is a super-2 number, since 2×12508562981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12508561981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6254281490 + 6254281491.

It is an arithmetic number, because the mean of its divisors is an integer number (6254281491).

Almost surely, 2^12508562981 is an apocalyptic number.

It is an amenable number.

12508562981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12508562981 is an equidigital number, since it uses as much as digits as its factorization.

12508562981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 47.

The spelling of 12508562981 in words is "twelve billion, five hundred eight million, five hundred sixty-two thousand, nine hundred eighty-one".