85644710779 has 4 divisors (see below), whose sum is σ = 85648283776. Its totient is φ = 85641137784.

The previous prime is 85644710761. The next prime is 85644710791. The reversal of 85644710779 is 97701744658.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85644710779 - 2⁹ = 85644710267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85644710759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750299 + ... + 1798564.

It is an arithmetic number, because the mean of its divisors is an integer number (21412070944).

Almost surely, 2^85644710779 is an apocalyptic number.

85644710779 is a deficient number, since it is larger than the sum of its proper divisors (3572997).

85644710779 is a wasteful number, since it uses less digits than its factorization.

85644710779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3572996.

The product of its (nonzero) digits is 11854080, while the sum is 58.

The spelling of 85644710779 in words is "eighty-five billion, six hundred forty-four million, seven hundred ten thousand, seven hundred seventy-nine".