85846664993 has 2 divisors, whose sum is σ = 85846664994. Its totient is φ = 85846664992.

The previous prime is 85846664851. The next prime is 85846664999. The reversal of 85846664993 is 39946664858.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85384930849 + 461734144 = 292207^2 + 21488^2 .

It is a cyclic number.

It is not a de Polignac number, because 85846664993 - 2³⁴ = 68666795809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85846664999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42923332496 + 42923332497.

It is an arithmetic number, because the mean of its divisors is an integer number (42923332497).

Almost surely, 2^85846664993 is an apocalyptic number.

It is an amenable number.

85846664993 is a deficient number, since it is larger than the sum of its proper divisors (1).

85846664993 is an equidigital number, since it uses as much as digits as its factorization.

85846664993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 268738560, while the sum is 68.

The spelling of 85846664993 in words is "eighty-five billion, eight hundred forty-six million, six hundred sixty-four thousand, nine hundred ninety-three".