25991739498 has 64 divisors (see below), whose sum is σ = 54577815552. Its totient is φ = 8245157760.

The previous prime is 25991739493. The next prime is 25991739601. The reversal of 25991739498 is 89493719952.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25991739493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1452715 + ... + 1470497.

It is an arithmetic number, because the mean of its divisors is an integer number (852778368).

Almost surely, 2^25991739498 is an apocalyptic number.

25991739498 is an abundant number, since it is smaller than the sum of its proper divisors (28586076054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25991739498 is a wasteful number, since it uses less digits than its factorization.

25991739498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17979.

The product of its digits is 44089920, while the sum is 66.

The spelling of 25991739498 in words is "twenty-five billion, nine hundred ninety-one million, seven hundred thirty-nine thousand, four hundred ninety-eight".