25557513916853 has 2 divisors, whose sum is σ = 25557513916854. Its totient is φ = 25557513916852.

The previous prime is 25557513916817. The next prime is 25557513916967. The reversal of 25557513916853 is 35861931575552.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18038385054244 + 7519128862609 = 4247162^2 + 2742103^2 .

It is a cyclic number.

It is not a de Polignac number, because 25557513916853 - 2²⁴ = 25557497139637 is a prime.

It is a super-2 number, since 2×25557513916853² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25557513916853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25557513916453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12778756958426 + 12778756958427.

It is an arithmetic number, because the mean of its divisors is an integer number (12778756958427).

Almost surely, 2^{25557513916853} is an apocalyptic number.

It is an amenable number.

25557513916853 is a deficient number, since it is larger than the sum of its proper divisors (1).

25557513916853 is an equidigital number, since it uses as much as digits as its factorization.

25557513916853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100000, while the sum is 65.

The spelling of 25557513916853 in words is "twenty-five trillion, five hundred fifty-seven billion, five hundred thirteen million, nine hundred sixteen thousand, eight hundred fifty-three".