81167606494 has 8 divisors (see below), whose sum is σ = 131116902840. Its totient is φ = 37461972216.

The previous prime is 81167606483. The next prime is 81167606519. The reversal of 81167606494 is 49460676118.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1560915484 + ... + 1560915535.

It is an arithmetic number, because the mean of its divisors is an integer number (16389612855).

Almost surely, 2^81167606494 is an apocalyptic number.

81167606494 is a deficient number, since it is larger than the sum of its proper divisors (49949296346).

81167606494 is a wasteful number, since it uses less digits than its factorization.

81167606494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3121831034.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 81167606494 in words is "eighty-one billion, one hundred sixty-seven million, six hundred six thousand, four hundred ninety-four".