85634909447 has 2 divisors, whose sum is σ = 85634909448. Its totient is φ = 85634909446.

The previous prime is 85634909359. The next prime is 85634909449. The reversal of 85634909447 is 74490943658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85634909447 - 2¹² = 85634905351 is a prime.

Together with 85634909449, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85634909449) 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, 42817454723 + 42817454724.

It is an arithmetic number, because the mean of its divisors is an integer number (42817454724).

Almost surely, 2^85634909447 is an apocalyptic number.

85634909447 is a deficient number, since it is larger than the sum of its proper divisors (1).

85634909447 is an equidigital number, since it uses as much as digits as its factorization.

85634909447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26127360, while the sum is 59.

The spelling of 85634909447 in words is "eighty-five billion, six hundred thirty-four million, nine hundred nine thousand, four hundred forty-seven".