81842918582 has 4 divisors (see below), whose sum is σ = 122764377876. Its totient is φ = 40921459290.

The previous prime is 81842918519. The next prime is 81842918587. The reversal of 81842918582 is 28581924818.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81842918587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20460729644 + ... + 20460729647.

It is an arithmetic number, because the mean of its divisors is an integer number (30691094469).

Almost surely, 2^81842918582 is an apocalyptic number.

81842918582 is a deficient number, since it is larger than the sum of its proper divisors (40921459294).

81842918582 is a wasteful number, since it uses less digits than its factorization.

81842918582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40921459293.

The product of its digits is 2949120, while the sum is 56.

The spelling of 81842918582 in words is "eighty-one billion, eight hundred forty-two million, nine hundred eighteen thousand, five hundred eighty-two".