25438998544 has 10 divisors (see below), whose sum is σ = 49288059710. Its totient is φ = 12719499264.

The previous prime is 25438998523. The next prime is 25438998547. The reversal of 25438998544 is 44589983452.

It can be written as a sum of positive squares in only one way, i.e., 13511737600 + 11927260944 = 116240^2 + 109212^2 .

It is not an unprimeable number, because it can be changed into a prime (25438998547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 794968689 + ... + 794968720.

It is an arithmetic number, because the mean of its divisors is an integer number (4928805971).

Almost surely, 2^25438998544 is an apocalyptic number.

It is an amenable number.

25438998544 is a deficient number, since it is larger than the sum of its proper divisors (23849061166).

25438998544 is a wasteful number, since it uses less digits than its factorization.

25438998544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589937417 (or 1589937411 counting only the distinct ones).

The product of its digits is 49766400, while the sum is 61.

The spelling of 25438998544 in words is "twenty-five billion, four hundred thirty-eight million, nine hundred ninety-eight thousand, five hundred forty-four".