25645444091 has 2 divisors, whose sum is σ = 25645444092. Its totient is φ = 25645444090.

The previous prime is 25645444063. The next prime is 25645444177. The reversal of 25645444091 is 19044454652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25645444091 is a prime.

It is not a weakly prime, because it can be changed into another prime (25645446091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12822722045 + 12822722046.

It is an arithmetic number, because the mean of its divisors is an integer number (12822722046).

Almost surely, 2^25645444091 is an apocalyptic number.

25645444091 is a deficient number, since it is larger than the sum of its proper divisors (1).

25645444091 is an equidigital number, since it uses as much as digits as its factorization.

25645444091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 25645444091 in words is "twenty-five billion, six hundred forty-five million, four hundred forty-four thousand, ninety-one".