81676334894 has 32 divisors (see below), whose sum is σ = 154896717312. Its totient is φ = 31373748000.

The previous prime is 81676334863. The next prime is 81676334923. The reversal of 81676334894 is 49843367618.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3724037 + ... + 3745904.

It is an arithmetic number, because the mean of its divisors is an integer number (4840522416).

Almost surely, 2^81676334894 is an apocalyptic number.

81676334894 is a deficient number, since it is larger than the sum of its proper divisors (73220382418).

81676334894 is a wasteful number, since it uses less digits than its factorization.

81676334894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7470032.

The product of its digits is 20901888, while the sum is 59.

The spelling of 81676334894 in words is "eighty-one billion, six hundred seventy-six million, three hundred thirty-four thousand, eight hundred ninety-four".