25131859217 has 2 divisors, whose sum is σ = 25131859218. Its totient is φ = 25131859216.

The previous prime is 25131859153. The next prime is 25131859229. The reversal of 25131859217 is 71295813152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17381521921 + 7750337296 = 131839^2 + 88036^2 .

It is a cyclic number.

It is not a de Polignac number, because 25131859217 - 2⁶ = 25131859153 is a prime.

It is a super-2 number, since 2×25131859217² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25131859117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12565929608 + 12565929609.

It is an arithmetic number, because the mean of its divisors is an integer number (12565929609).

Almost surely, 2^25131859217 is an apocalyptic number.

It is an amenable number.

25131859217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25131859217 is an equidigital number, since it uses as much as digits as its factorization.

25131859217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 44.

The spelling of 25131859217 in words is "twenty-five billion, one hundred thirty-one million, eight hundred fifty-nine thousand, two hundred seventeen".