25555027697 has 4 divisors (see below), whose sum is σ = 25726538100. Its totient is φ = 25383517296.

The previous prime is 25555027669. The next prime is 25555027699. The reversal of 25555027697 is 79672055552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12733768336 + 12821259361 = 112844^2 + 113231^2 .

It is a cyclic number.

It is not a de Polignac number, because 25555027697 - 2²⁸ = 25286592241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25555027699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85754978 + ... + 85755275.

It is an arithmetic number, because the mean of its divisors is an integer number (6431634525).

Almost surely, 2^25555027697 is an apocalyptic number.

It is an amenable number.

25555027697 is a deficient number, since it is larger than the sum of its proper divisors (171510403).

25555027697 is a wasteful number, since it uses less digits than its factorization.

25555027697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171510402.

The product of its (nonzero) digits is 6615000, while the sum is 53.

The spelling of 25555027697 in words is "twenty-five billion, five hundred fifty-five million, twenty-seven thousand, six hundred ninety-seven".