85840808639 has 2 divisors, whose sum is σ = 85840808640. Its totient is φ = 85840808638.

The previous prime is 85840808623. The next prime is 85840808659. The reversal of 85840808639 is 93680804858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85840808639 - 2⁴ = 85840808623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85840808659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42920404319 + 42920404320.

It is an arithmetic number, because the mean of its divisors is an integer number (42920404320).

Almost surely, 2^85840808639 is an apocalyptic number.

85840808639 is a deficient number, since it is larger than the sum of its proper divisors (1).

85840808639 is an equidigital number, since it uses as much as digits as its factorization.

85840808639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13271040, while the sum is 59.

The spelling of 85840808639 in words is "eighty-five billion, eight hundred forty million, eight hundred eight thousand, six hundred thirty-nine".