25250055557 has 8 divisors (see below), whose sum is σ = 25669290840. Its totient is φ = 24830991360.

The previous prime is 25250055553. The next prime is 25250055563. The reversal of 25250055557 is 75555005252.

It can be written as a sum of positive squares in 4 ways, for example, as 2754255361 + 22495800196 = 52481^2 + 149986^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25250055557 - 2² = 25250055553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25250055553) 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, 274169 + ... + 354497.

It is an arithmetic number, because the mean of its divisors is an integer number (3208661355).

Almost surely, 2^25250055557 is an apocalyptic number.

It is an amenable number.

25250055557 is a deficient number, since it is larger than the sum of its proper divisors (419235283).

25250055557 is an equidigital number, since it uses as much as digits as its factorization.

25250055557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85543.

The product of its (nonzero) digits is 437500, while the sum is 41.

The spelling of 25250055557 in words is "twenty-five billion, two hundred fifty million, fifty-five thousand, five hundred fifty-seven".