25054442478 has 256 divisors, whose sum is σ = 68064675840. Its totient is φ = 6749816832.

The previous prime is 25054442447. The next prime is 25054442489. The reversal of 25054442478 is 87424445052.

25054442478 is a `hidden beast` number, since 25 + 0 + 544 + 42 + 47 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10154601 + ... + 10157067.

It is an arithmetic number, because the mean of its divisors is an integer number (265877640).

Almost surely, 2^25054442478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25054442478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34032337920).

25054442478 is an abundant number, since it is smaller than the sum of its proper divisors (43010233362).

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

25054442478 is a wasteful number, since it uses less digits than its factorization.

25054442478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2568 (or 2562 counting only the distinct ones).

The product of its (nonzero) digits is 1433600, while the sum is 45.

The spelling of 25054442478 in words is "twenty-five billion, fifty-four million, four hundred forty-two thousand, four hundred seventy-eight".