25504513878 has 16 divisors (see below), whose sum is σ = 51086439360. Its totient is φ = 8488602696.

The previous prime is 25504513873. The next prime is 25504513921. The reversal of 25504513878 is 87831540552.

25504513878 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25504513871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3221200 + ... + 3229107.

It is an arithmetic number, because the mean of its divisors is an integer number (3192902460).

Almost surely, 2^25504513878 is an apocalyptic number.

25504513878 is an abundant number, since it is smaller than the sum of its proper divisors (25581925482).

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

25504513878 is a wasteful number, since it uses less digits than its factorization.

25504513878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6450971.

The product of its (nonzero) digits is 1344000, while the sum is 48.

The spelling of 25504513878 in words is "twenty-five billion, five hundred four million, five hundred thirteen thousand, eight hundred seventy-eight".