12566700357889 has 4 divisors (see below), whose sum is σ = 12696253969924. Its totient is φ = 12437146745856.

The previous prime is 12566700357863. The next prime is 12566700357899. The reversal of 12566700357889 is 98875300766521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3022104096400 + 9544596261489 = 1738420^2 + 3089433^2 .

It is a cyclic number.

It is not a de Polignac number, because 12566700357889 - 2¹⁵ = 12566700325121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12566700357899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64776805872 + ... + 64776806065.

It is an arithmetic number, because the mean of its divisors is an integer number (3174063492481).

Almost surely, 2^{12566700357889} is an apocalyptic number.

It is an amenable number.

12566700357889 is a deficient number, since it is larger than the sum of its proper divisors (129553612035).

12566700357889 is an equidigital number, since it uses as much as digits as its factorization.

12566700357889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129553612034.

The product of its (nonzero) digits is 152409600, while the sum is 67.

The spelling of 12566700357889 in words is "twelve trillion, five hundred sixty-six billion, seven hundred million, three hundred fifty-seven thousand, eight hundred eighty-nine".