12581660225 has 12 divisors (see below), whose sum is σ = 15857018940. Its totient is φ = 9900321600.

The previous prime is 12581660213. The next prime is 12581660233. The reversal of 12581660225 is 52206618521.

It is a Cunningham number, because it is equal to 112168²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 986462464 + 11595197761 = 31408^2 + 107681^2 .

It is not a de Polignac number, because 12581660225 - 2⁴ = 12581660209 is a prime.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 4123610 + ... + 4126659.

It is an arithmetic number, because the mean of its divisors is an integer number (1321418245).

Almost surely, 2^12581660225 is an apocalyptic number.

It is an amenable number.

12581660225 is a deficient number, since it is larger than the sum of its proper divisors (3275358715).

12581660225 is an equidigital number, since it uses as much as digits as its factorization.

12581660225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8250340 (or 8250335 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 12581660225 in words is "twelve billion, five hundred eighty-one million, six hundred sixty thousand, two hundred twenty-five".