25543201091 has 2 divisors, whose sum is σ = 25543201092. Its totient is φ = 25543201090.

The previous prime is 25543201031. The next prime is 25543201109. The reversal of 25543201091 is 19010234552.

Together with next prime (25543201109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25543201091 - 2⁶ = 25543201027 is a prime.

It is not a weakly prime, because it can be changed into another prime (25543201001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12771600545 + 12771600546.

It is an arithmetic number, because the mean of its divisors is an integer number (12771600546).

Almost surely, 2^25543201091 is an apocalyptic number.

25543201091 is a deficient number, since it is larger than the sum of its proper divisors (1).

25543201091 is an equidigital number, since it uses as much as digits as its factorization.

25543201091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 25543201091 in words is "twenty-five billion, five hundred forty-three million, two hundred one thousand, ninety-one".