85841378989 has 2 divisors, whose sum is σ = 85841378990. Its totient is φ = 85841378988.

The previous prime is 85841378957. The next prime is 85841378999. The reversal of 85841378989 is 98987314858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57463281225 + 28378097764 = 239715^2 + 168458^2 .

It is a cyclic number.

It is not a de Polignac number, because 85841378989 - 2⁵ = 85841378957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85841378999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42920689494 + 42920689495.

It is an arithmetic number, because the mean of its divisors is an integer number (42920689495).

Almost surely, 2^85841378989 is an apocalyptic number.

It is an amenable number.

85841378989 is a deficient number, since it is larger than the sum of its proper divisors (1).

85841378989 is an equidigital number, since it uses as much as digits as its factorization.

85841378989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139345920, while the sum is 70.

The spelling of 85841378989 in words is "eighty-five billion, eight hundred forty-one million, three hundred seventy-eight thousand, nine hundred eighty-nine".