25552642439 has 2 divisors, whose sum is σ = 25552642440. Its totient is φ = 25552642438.

The previous prime is 25552642403. The next prime is 25552642463. The reversal of 25552642439 is 93424625552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25552642439 - 2¹² = 25552638343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25552642393 and 25552642402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25552642639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12776321219 + 12776321220.

It is an arithmetic number, because the mean of its divisors is an integer number (12776321220).

Almost surely, 2^25552642439 is an apocalyptic number.

25552642439 is a deficient number, since it is larger than the sum of its proper divisors (1).

25552642439 is an equidigital number, since it uses as much as digits as its factorization.

25552642439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592000, while the sum is 47.

The spelling of 25552642439 in words is "twenty-five billion, five hundred fifty-two million, six hundred forty-two thousand, four hundred thirty-nine".