25489938671 has 2 divisors, whose sum is σ = 25489938672. Its totient is φ = 25489938670.

The previous prime is 25489938637. The next prime is 25489938689. The reversal of 25489938671 is 17683998452.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25489938671 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25489938611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12744969335 + 12744969336.

It is an arithmetic number, because the mean of its divisors is an integer number (12744969336).

Almost surely, 2^25489938671 is an apocalyptic number.

25489938671 is a deficient number, since it is larger than the sum of its proper divisors (1).

25489938671 is an equidigital number, since it uses as much as digits as its factorization.

25489938671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 62.

The spelling of 25489938671 in words is "twenty-five billion, four hundred eighty-nine million, nine hundred thirty-eight thousand, six hundred seventy-one".