81373944846 has 64 divisors (see below), whose sum is σ = 183995463168. Its totient is φ = 23851204608.

The previous prime is 81373944833. The next prime is 81373944887. The reversal of 81373944846 is 64844937318.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302451 + ... + 504206.

It is an arithmetic number, because the mean of its divisors is an integer number (2874929112).

Almost surely, 2^81373944846 is an apocalyptic number.

81373944846 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

81373944846 is an abundant number, since it is smaller than the sum of its proper divisors (102621518322).

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

81373944846 is a wasteful number, since it uses less digits than its factorization.

81373944846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806745.

The product of its digits is 13934592, while the sum is 57.

The spelling of 81373944846 in words is "eighty-one billion, three hundred seventy-three million, nine hundred forty-four thousand, eight hundred forty-six".