81396573846 has 16 divisors (see below), whose sum is σ = 186049311744. Its totient is φ = 23256163944.

The previous prime is 81396573829. The next prime is 81396573847. The reversal of 81396573846 is 64837569318.

It is a self number, because there is not a number n which added to its sum of digits gives 81396573846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81396573847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 969006790 + ... + 969006873.

It is an arithmetic number, because the mean of its divisors is an integer number (11628081984).

Almost surely, 2^81396573846 is an apocalyptic number.

81396573846 is an abundant number, since it is smaller than the sum of its proper divisors (104652737898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81396573846 is a wasteful number, since it uses less digits than its factorization.

81396573846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938013675.

The product of its digits is 26127360, while the sum is 60.

The spelling of 81396573846 in words is "eighty-one billion, three hundred ninety-six million, five hundred seventy-three thousand, eight hundred forty-six".