25693750091 has 2 divisors, whose sum is σ = 25693750092. Its totient is φ = 25693750090.

The previous prime is 25693750039. The next prime is 25693750109. The reversal of 25693750091 is 19005739652.

Together with next prime (25693750109) 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 a de Polignac number, because none of the positive numbers 2^k-25693750091 is a prime.

It is not a weakly prime, because it can be changed into another prime (25693750391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12846875045 + 12846875046.

It is an arithmetic number, because the mean of its divisors is an integer number (12846875046).

Almost surely, 2^25693750091 is an apocalyptic number.

25693750091 is a deficient number, since it is larger than the sum of its proper divisors (1).

25693750091 is an equidigital number, since it uses as much as digits as its factorization.

25693750091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 510300, while the sum is 47.

The spelling of 25693750091 in words is "twenty-five billion, six hundred ninety-three million, seven hundred fifty thousand, ninety-one".