25171250566513 has 2 divisors, whose sum is σ = 25171250566514. Its totient is φ = 25171250566512.

The previous prime is 25171250566471. The next prime is 25171250566541. The reversal of 25171250566513 is 31566505217152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24035261240929 + 1135989325584 = 4902577^2 + 1065828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25171250566513 is a prime.

It is not a weakly prime, because it can be changed into another prime (25171250566313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12585625283256 + 12585625283257.

It is an arithmetic number, because the mean of its divisors is an integer number (12585625283257).

Almost surely, 2^{25171250566513} is an apocalyptic number.

It is an amenable number.

25171250566513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25171250566513 is an equidigital number, since it uses as much as digits as its factorization.

25171250566513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890000, while the sum is 49.

The spelling of 25171250566513 in words is "twenty-five trillion, one hundred seventy-one billion, two hundred fifty million, five hundred sixty-six thousand, five hundred thirteen".