25438680847 has 16 divisors (see below), whose sum is σ = 27640720800. Its totient is φ = 23318249472.

The previous prime is 25438680829. The next prime is 25438680859. The reversal of 25438680847 is 74808683452.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25438680847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25438680887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205263 + ... + 304975.

It is an arithmetic number, because the mean of its divisors is an integer number (1727545050).

Almost surely, 2^25438680847 is an apocalyptic number.

25438680847 is a deficient number, since it is larger than the sum of its proper divisors (2202039953).

25438680847 is a wasteful number, since it uses less digits than its factorization.

25438680847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100122.

The product of its (nonzero) digits is 10321920, while the sum is 55.

The spelling of 25438680847 in words is "twenty-five billion, four hundred thirty-eight million, six hundred eighty thousand, eight hundred forty-seven".