985204585991 has 2 divisors, whose sum is σ = 985204585992. Its totient is φ = 985204585990.

The previous prime is 985204585987. The next prime is 985204586011. The reversal of 985204585991 is 199585402589.

985204585991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 985204585991 - 2² = 985204585987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985204585891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492602292995 + 492602292996.

It is an arithmetic number, because the mean of its divisors is an integer number (492602292996).

Almost surely, 2^985204585991 is an apocalyptic number.

985204585991 is a deficient number, since it is larger than the sum of its proper divisors (1).

985204585991 is an equidigital number, since it uses as much as digits as its factorization.

985204585991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656000, while the sum is 65.

The spelling of 985204585991 in words is "nine hundred eighty-five billion, two hundred four million, five hundred eighty-five thousand, nine hundred ninety-one".