25431215423 has 2 divisors, whose sum is σ = 25431215424. Its totient is φ = 25431215422.

The previous prime is 25431215413. The next prime is 25431215429. The reversal of 25431215423 is 32451213452.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25431215423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25431215423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25431215429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12715607711 + 12715607712.

It is an arithmetic number, because the mean of its divisors is an integer number (12715607712).

Almost surely, 2^25431215423 is an apocalyptic number.

25431215423 is a deficient number, since it is larger than the sum of its proper divisors (1).

25431215423 is an equidigital number, since it uses as much as digits as its factorization.

25431215423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 32.

Adding to 25431215423 its reverse (32451213452), we get a palindrome (57882428875).

The spelling of 25431215423 in words is "twenty-five billion, four hundred thirty-one million, two hundred fifteen thousand, four hundred twenty-three".