85856791829 has 2 divisors, whose sum is σ = 85856791830. Its totient is φ = 85856791828.

The previous prime is 85856791763. The next prime is 85856791847. The reversal of 85856791829 is 92819765858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58035219025 + 27821572804 = 240905^2 + 166798^2 .

It is a cyclic number.

It is not a de Polignac number, because 85856791829 - 2¹² = 85856787733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85856791859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42928395914 + 42928395915.

It is an arithmetic number, because the mean of its divisors is an integer number (42928395915).

Almost surely, 2^85856791829 is an apocalyptic number.

It is an amenable number.

85856791829 is a deficient number, since it is larger than the sum of its proper divisors (1).

85856791829 is an equidigital number, since it uses as much as digits as its factorization.

85856791829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87091200, while the sum is 68.

The spelling of 85856791829 in words is "eighty-five billion, eight hundred fifty-six million, seven hundred ninety-one thousand, eight hundred twenty-nine".