25581361453 has 2 divisors, whose sum is σ = 25581361454. Its totient is φ = 25581361452.

The previous prime is 25581361447. The next prime is 25581361543. The reversal of 25581361453 is 35416318552.

Together with next prime (25581361543) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24643348324 + 938013129 = 156982^2 + 30627^2 .

It is a cyclic number.

It is not a de Polignac number, because 25581361453 - 2¹³ = 25581353261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25581361433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12790680726 + 12790680727.

It is an arithmetic number, because the mean of its divisors is an integer number (12790680727).

Almost surely, 2^25581361453 is an apocalyptic number.

It is an amenable number.

25581361453 is a deficient number, since it is larger than the sum of its proper divisors (1).

25581361453 is an equidigital number, since it uses as much as digits as its factorization.

25581361453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432000, while the sum is 43.

The spelling of 25581361453 in words is "twenty-five billion, five hundred eighty-one million, three hundred sixty-one thousand, four hundred fifty-three".