13444578857 has 2 divisors, whose sum is σ = 13444578858. Its totient is φ = 13444578856.

The previous prime is 13444578817. The next prime is 13444578893. The reversal of 13444578857 is 75887544431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13438373776 + 6205081 = 115924^2 + 2491^2 .

It is a cyclic number.

It is not a de Polignac number, because 13444578857 - 2¹⁸ = 13444316713 is a prime.

It is not a weakly prime, because it can be changed into another prime (13444578817) by changing a digit.

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 as a sum of consecutive naturals, namely, 6722289428 + 6722289429.

It is an arithmetic number, because the mean of its divisors is an integer number (6722289429).

Almost surely, 2^13444578857 is an apocalyptic number.

It is an amenable number.

13444578857 is a deficient number, since it is larger than the sum of its proper divisors (1).

13444578857 is an equidigital number, since it uses as much as digits as its factorization.

13444578857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15052800, while the sum is 56.

The spelling of 13444578857 in words is "thirteen billion, four hundred forty-four million, five hundred seventy-eight thousand, eight hundred fifty-seven".