25548752778 has 8 divisors (see below), whose sum is σ = 51097505568. Its totient is φ = 8516250924.

The previous prime is 25548752773. The next prime is 25548752783. The reversal of 25548752778 is 87725784552.

It is an interprime number because it is at equal distance from previous prime (25548752773) and next prime (25548752783).

It is a sphenic number, since it is the product of 3 distinct primes.

25548752778 is an admirable number.

It is a super-2 number, since 2×25548752778² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25548752773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2129062726 + ... + 2129062737.

It is an arithmetic number, because the mean of its divisors is an integer number (6387188196).

Almost surely, 2^25548752778 is an apocalyptic number.

25548752778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25548752778 is a wasteful number, since it uses less digits than its factorization.

25548752778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4258125468.

The product of its digits is 43904000, while the sum is 60.

The spelling of 25548752778 in words is "twenty-five billion, five hundred forty-eight million, seven hundred fifty-two thousand, seven hundred seventy-eight".