25406226247 has 2 divisors, whose sum is σ = 25406226248. Its totient is φ = 25406226246.

The previous prime is 25406226239. The next prime is 25406226277. The reversal of 25406226247 is 74262260452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25406226247 - 2³ = 25406226239 is a prime.

It is a super-2 number, since 2×25406226247² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25406226277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12703113123 + 12703113124.

It is an arithmetic number, because the mean of its divisors is an integer number (12703113124).

Almost surely, 2^25406226247 is an apocalyptic number.

25406226247 is a deficient number, since it is larger than the sum of its proper divisors (1).

25406226247 is an equidigital number, since it uses as much as digits as its factorization.

25406226247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 40.

Adding to 25406226247 its reverse (74262260452), we get a palindrome (99668486699).

The spelling of 25406226247 in words is "twenty-five billion, four hundred six million, two hundred twenty-six thousand, two hundred forty-seven".