25005527778 has 64 divisors (see below), whose sum is σ = 62461301760. Its totient is φ = 6483499200.

The previous prime is 25005527759. The next prime is 25005527801. The reversal of 25005527778 is 87772550052.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216408 + ... + 311196.

It is an arithmetic number, because the mean of its divisors is an integer number (975957840).

Almost surely, 2^25005527778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25005527778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31230650880).

25005527778 is an abundant number, since it is smaller than the sum of its proper divisors (37455773982).

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

25005527778 is a wasteful number, since it uses less digits than its factorization.

25005527778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95383.

The product of its (nonzero) digits is 1372000, while the sum is 48.

The spelling of 25005527778 in words is "twenty-five billion, five million, five hundred twenty-seven thousand, seven hundred seventy-eight".