25144889542 has 4 divisors (see below), whose sum is σ = 37717334316. Its totient is φ = 12572444770.

The previous prime is 25144889527. The next prime is 25144889543. The reversal of 25144889542 is 24598844152.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25144889542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25144889543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6286222384 + ... + 6286222387.

It is an arithmetic number, because the mean of its divisors is an integer number (9429333579).

Almost surely, 2^25144889542 is an apocalyptic number.

25144889542 is a deficient number, since it is larger than the sum of its proper divisors (12572444774).

25144889542 is a wasteful number, since it uses less digits than its factorization.

25144889542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12572444773.

The product of its digits is 3686400, while the sum is 52.

The spelling of 25144889542 in words is "twenty-five billion, one hundred forty-four million, eight hundred eighty-nine thousand, five hundred forty-two".