25550027778 has 16 divisors (see below), whose sum is σ = 55745515296. Its totient is φ = 7742432640.

The previous prime is 25550027777. The next prime is 25550027819. The reversal of 25550027778 is 87772005552.

It is not an unprimeable number, because it can be changed into a prime (25550027777) 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, 193560751 + ... + 193560882.

It is an arithmetic number, because the mean of its divisors is an integer number (3484094706).

Almost surely, 2^25550027778 is an apocalyptic number.

25550027778 is an abundant number, since it is smaller than the sum of its proper divisors (30195487518).

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

25550027778 is a wasteful number, since it uses less digits than its factorization.

25550027778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387121649.

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

The spelling of 25550027778 in words is "twenty-five billion, five hundred fifty million, twenty-seven thousand, seven hundred seventy-eight".