85209247993 has 2 divisors, whose sum is σ = 85209247994. Its totient is φ = 85209247992.

The previous prime is 85209247987. The next prime is 85209248027. The reversal of 85209247993 is 39974290258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79358833849 + 5850414144 = 281707^2 + 76488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85209247993 is a prime.

It is not a weakly prime, because it can be changed into another prime (85209247913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42604623996 + 42604623997.

It is an arithmetic number, because the mean of its divisors is an integer number (42604623997).

Almost surely, 2^85209247993 is an apocalyptic number.

It is an amenable number.

85209247993 is a deficient number, since it is larger than the sum of its proper divisors (1).

85209247993 is an equidigital number, since it uses as much as digits as its factorization.

85209247993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 85209247993 in words is "eighty-five billion, two hundred nine million, two hundred forty-seven thousand, nine hundred ninety-three".