25575181517 has 2 divisors, whose sum is σ = 25575181518. Its totient is φ = 25575181516.

The previous prime is 25575181469. The next prime is 25575181547. The reversal of 25575181517 is 71518157552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22217094916 + 3358086601 = 149054^2 + 57949^2 .

It is a cyclic number.

It is not a de Polignac number, because 25575181517 - 2³⁰ = 24501439693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25575181547) 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, 12787590758 + 12787590759.

It is an arithmetic number, because the mean of its divisors is an integer number (12787590759).

Almost surely, 2^25575181517 is an apocalyptic number.

It is an amenable number.

25575181517 is a deficient number, since it is larger than the sum of its proper divisors (1).

25575181517 is an equidigital number, since it uses as much as digits as its factorization.

25575181517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 490000, while the sum is 47.

The spelling of 25575181517 in words is "twenty-five billion, five hundred seventy-five million, one hundred eighty-one thousand, five hundred seventeen".