25843310491 has 2 divisors, whose sum is σ = 25843310492. Its totient is φ = 25843310490.

The previous prime is 25843310489. The next prime is 25843310533. The reversal of 25843310491 is 19401334852.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25843310491 - 2¹ = 25843310489 is a prime.

It is a super-2 number, since 2×25843310491² (a number of 22 digits) contains 22 as substring.

Together with 25843310489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25843310411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12921655245 + 12921655246.

It is an arithmetic number, because the mean of its divisors is an integer number (12921655246).

Almost surely, 2^25843310491 is an apocalyptic number.

25843310491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25843310491 is an equidigital number, since it uses as much as digits as its factorization.

25843310491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 25843310491 in words is "twenty-five billion, eight hundred forty-three million, three hundred ten thousand, four hundred ninety-one".