25518484493 has 2 divisors, whose sum is σ = 25518484494. Its totient is φ = 25518484492.

The previous prime is 25518484487. The next prime is 25518484499. The reversal of 25518484493 is 39448481552.

It is a balanced prime because it is at equal distance from previous prime (25518484487) and next prime (25518484499).

It can be written as a sum of positive squares in only one way, i.e., 14133167689 + 11385316804 = 118883^2 + 106702^2 .

It is a cyclic number.

It is not a de Polignac number, because 25518484493 - 2⁸ = 25518484237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25518484499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12759242246 + 12759242247.

It is an arithmetic number, because the mean of its divisors is an integer number (12759242247).

Almost surely, 2^25518484493 is an apocalyptic number.

It is an amenable number.

25518484493 is a deficient number, since it is larger than the sum of its proper divisors (1).

25518484493 is an equidigital number, since it uses as much as digits as its factorization.

25518484493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5529600, while the sum is 53.

The spelling of 25518484493 in words is "twenty-five billion, five hundred eighteen million, four hundred eighty-four thousand, four hundred ninety-three".