25949117778 has 8 divisors (see below), whose sum is σ = 51898235568. Its totient is φ = 8649705924.

The previous prime is 25949117767. The next prime is 25949117801. The reversal of 25949117778 is 87771194952.

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

25949117778 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2162426476 + ... + 2162426487.

It is an arithmetic number, because the mean of its divisors is an integer number (6487279446).

Almost surely, 2^25949117778 is an apocalyptic number.

25949117778 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.

25949117778 is a wasteful number, since it uses less digits than its factorization.

25949117778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4324852968.

The product of its digits is 8890560, while the sum is 60.

The spelling of 25949117778 in words is "twenty-five billion, nine hundred forty-nine million, one hundred seventeen thousand, seven hundred seventy-eight".