25236423179509 has 2 divisors, whose sum is σ = 25236423179510. Its totient is φ = 25236423179508.

The previous prime is 25236423179497. The next prime is 25236423179609. The reversal of 25236423179509 is 90597132463252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21636656916484 + 3599766263025 = 4651522^2 + 1897305^2 .

It is a cyclic number.

It is not a de Polignac number, because 25236423179509 - 2²³ = 25236414790901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25236423179609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12618211589754 + 12618211589755.

It is an arithmetic number, because the mean of its divisors is an integer number (12618211589755).

Almost surely, 2^{25236423179509} is an apocalyptic number.

It is an amenable number.

25236423179509 is a deficient number, since it is larger than the sum of its proper divisors (1).

25236423179509 is an equidigital number, since it uses as much as digits as its factorization.

25236423179509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24494400, while the sum is 58.

The spelling of 25236423179509 in words is "twenty-five trillion, two hundred thirty-six billion, four hundred twenty-three million, one hundred seventy-nine thousand, five hundred nine".