25257755778 has 16 divisors (see below), whose sum is σ = 50517068736. Its totient is φ = 8418992400.

The previous prime is 25257755723. The next prime is 25257755779. The reversal of 25257755778 is 87755775252.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25257755779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355428 + ... + 420528.

It is an arithmetic number, because the mean of its divisors is an integer number (3157316796).

Almost surely, 2^25257755778 is an apocalyptic number.

25257755778 is an abundant number, since it is smaller than the sum of its proper divisors (25259312958).

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

25257755778 is a wasteful number, since it uses less digits than its factorization.

25257755778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129769.

The product of its digits is 48020000, while the sum is 60.

The spelling of 25257755778 in words is "twenty-five billion, two hundred fifty-seven million, seven hundred fifty-five thousand, seven hundred seventy-eight".