25045113581 has 2 divisors, whose sum is σ = 25045113582. Its totient is φ = 25045113580.

The previous prime is 25045113469. The next prime is 25045113593. The reversal of 25045113581 is 18531154052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22337992681 + 2707120900 = 149459^2 + 52030^2 .

It is a cyclic number.

It is not a de Polignac number, because 25045113581 - 2¹⁸ = 25044851437 is a prime.

It is a super-2 number, since 2×25045113581² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25045110581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12522556790 + 12522556791.

It is an arithmetic number, because the mean of its divisors is an integer number (12522556791).

Almost surely, 2^25045113581 is an apocalyptic number.

It is an amenable number.

25045113581 is a deficient number, since it is larger than the sum of its proper divisors (1).

25045113581 is an equidigital number, since it uses as much as digits as its factorization.

25045113581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 35.

The spelling of 25045113581 in words is "twenty-five billion, forty-five million, one hundred thirteen thousand, five hundred eighty-one".