25555121055 has 128 divisors (see below), whose sum is σ = 49559040000. Its totient is φ = 12445415424.

The previous prime is 25555121047. The next prime is 25555121057. The reversal of 25555121055 is 55012155552.

25555121055 is a `hidden beast` number, since 2 + 55 + 551 + 2 + 1 + 0 + 55 = 666.

It is not a de Polignac number, because 25555121055 - 2³ = 25555121047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25555121057) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10695801 + ... + 10698189.

It is an arithmetic number, because the mean of its divisors is an integer number (387180000).

Almost surely, 2^25555121055 is an apocalyptic number.

25555121055 is a deficient number, since it is larger than the sum of its proper divisors (24003918945).

25555121055 is a wasteful number, since it uses less digits than its factorization.

25555121055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558 (or 2552 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 36.

The spelling of 25555121055 in words is "twenty-five billion, five hundred fifty-five million, one hundred twenty-one thousand, fifty-five".