12557187047929 has 2 divisors, whose sum is σ = 12557187047930. Its totient is φ = 12557187047928.

The previous prime is 12557187047927. The next prime is 12557187047939. The reversal of 12557187047929 is 92974078175521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9072144000000 + 3485043047929 = 3012000^2 + 1866827^2 .

It is a cyclic number.

It is not a de Polignac number, because 12557187047929 - 2¹ = 12557187047927 is a prime.

Together with 12557187047927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12557187047921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6278593523964 + 6278593523965.

It is an arithmetic number, because the mean of its divisors is an integer number (6278593523965).

Almost surely, 2^{12557187047929} is an apocalyptic number.

It is an amenable number.

12557187047929 is a deficient number, since it is larger than the sum of its proper divisors (1).

12557187047929 is an equidigital number, since it uses as much as digits as its factorization.

12557187047929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88905600, while the sum is 67.

The spelling of 12557187047929 in words is "twelve trillion, five hundred fifty-seven billion, one hundred eighty-seven million, forty-seven thousand, nine hundred twenty-nine".