25461639499 has 2 divisors, whose sum is σ = 25461639500. Its totient is φ = 25461639498.

The previous prime is 25461639431. The next prime is 25461639509. The reversal of 25461639499 is 99493616452.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25461639499 - 2²³ = 25453250891 is a prime.

It is not a weakly prime, because it can be changed into another prime (25461639899) 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, 12730819749 + 12730819750.

It is an arithmetic number, because the mean of its divisors is an integer number (12730819750).

Almost surely, 2^25461639499 is an apocalyptic number.

25461639499 is a deficient number, since it is larger than the sum of its proper divisors (1).

25461639499 is an equidigital number, since it uses as much as digits as its factorization.

25461639499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12597120, while the sum is 58.

The spelling of 25461639499 in words is "twenty-five billion, four hundred sixty-one million, six hundred thirty-nine thousand, four hundred ninety-nine".