85447981823 has 4 divisors (see below), whose sum is σ = 85448608248. Its totient is φ = 85447355400.

The previous prime is 85447981769. The next prime is 85447981847. The reversal of 85447981823 is 32818974458.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 85447981823 - 2²² = 85443787519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85447984823) 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 in 3 ways as a sum of consecutive naturals, for example, 12128 + ... + 413573.

It is an arithmetic number, because the mean of its divisors is an integer number (21362152062).

Almost surely, 2^85447981823 is an apocalyptic number.

85447981823 is a deficient number, since it is larger than the sum of its proper divisors (626425).

85447981823 is a wasteful number, since it uses less digits than its factorization.

85447981823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626424.

The product of its digits is 15482880, while the sum is 59.

The spelling of 85447981823 in words is "eighty-five billion, four hundred forty-seven million, nine hundred eighty-one thousand, eight hundred twenty-three".