81831670654 has 8 divisors (see below), whose sum is σ = 122991538320. Its totient is φ = 40834491216.

The previous prime is 81831670639. The next prime is 81831670727. The reversal of 81831670654 is 45607613818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 81831670598 and 81831670607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40670799 + ... + 40672810.

It is an arithmetic number, because the mean of its divisors is an integer number (15373942290).

Almost surely, 2^81831670654 is an apocalyptic number.

81831670654 is a deficient number, since it is larger than the sum of its proper divisors (41159867666).

81831670654 is a wasteful number, since it uses less digits than its factorization.

81831670654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81344114.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 81831670654 in words is "eighty-one billion, eight hundred thirty-one million, six hundred seventy thousand, six hundred fifty-four".