25550052778 has 16 divisors (see below), whose sum is σ = 38980537920. Its totient is φ = 12556605600.

The previous prime is 25550052769. The next prime is 25550052851. The reversal of 25550052778 is 87725005552.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1078723 + ... + 1102153.

It is an arithmetic number, because the mean of its divisors is an integer number (2436283620).

Almost surely, 2^25550052778 is an apocalyptic number.

25550052778 is a deficient number, since it is larger than the sum of its proper divisors (13430485142).

25550052778 is a wasteful number, since it uses less digits than its factorization.

25550052778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32733.

The product of its (nonzero) digits is 980000, while the sum is 46.

The spelling of 25550052778 in words is "twenty-five billion, five hundred fifty million, fifty-two thousand, seven hundred seventy-eight".