25549378838 has 16 divisors (see below), whose sum is σ = 38396877120. Its totient is φ = 12750439296.

The previous prime is 25549378837. The next prime is 25549378849. The reversal of 25549378838 is 83887394552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25549378837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4162820 + ... + 4168952.

It is an arithmetic number, because the mean of its divisors is an integer number (2399804820).

Almost surely, 2^25549378838 is an apocalyptic number.

25549378838 is a deficient number, since it is larger than the sum of its proper divisors (12847498282).

25549378838 is a wasteful number, since it uses less digits than its factorization.

25549378838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9751.

The product of its digits is 58060800, while the sum is 62.

The spelling of 25549378838 in words is "twenty-five billion, five hundred forty-nine million, three hundred seventy-eight thousand, eight hundred thirty-eight".