25004531557 has 2 divisors, whose sum is σ = 25004531558. Its totient is φ = 25004531556.

The previous prime is 25004531501. The next prime is 25004531593. The reversal of 25004531557 is 75513540052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17171219521 + 7833312036 = 131039^2 + 88506^2 .

It is a cyclic number.

It is not a de Polignac number, because 25004531557 - 2¹⁵ = 25004498789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25004331557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12502265778 + 12502265779.

It is an arithmetic number, because the mean of its divisors is an integer number (12502265779).

Almost surely, 2^25004531557 is an apocalyptic number.

It is an amenable number.

25004531557 is a deficient number, since it is larger than the sum of its proper divisors (1).

25004531557 is an equidigital number, since it uses as much as digits as its factorization.

25004531557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105000, while the sum is 37.

The spelling of 25004531557 in words is "twenty-five billion, four million, five hundred thirty-one thousand, five hundred fifty-seven".