25189245509 has 2 divisors, whose sum is σ = 25189245510. Its totient is φ = 25189245508.

The previous prime is 25189245479. The next prime is 25189245539. The reversal of 25189245509 is 90554298152.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (25189245479) and next prime (25189245539).

It can be written as a sum of positive squares in only one way, i.e., 24181183009 + 1008062500 = 155503^2 + 31750^2 .

It is a cyclic number.

It is not a de Polignac number, because 25189245509 - 2²⁰ = 25188196933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25189245539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12594622754 + 12594622755.

It is an arithmetic number, because the mean of its divisors is an integer number (12594622755).

Almost surely, 2^25189245509 is an apocalyptic number.

It is an amenable number.

25189245509 is a deficient number, since it is larger than the sum of its proper divisors (1).

25189245509 is an equidigital number, since it uses as much as digits as its factorization.

25189245509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296000, while the sum is 50.

The spelling of 25189245509 in words is "twenty-five billion, one hundred eighty-nine million, two hundred forty-five thousand, five hundred nine".