81213694847999 has 8 divisors (see below), whose sum is σ = 92815739394048. Its totient is φ = 69611672336760.

The previous prime is 81213694847953. The next prime is 81213694848137. The reversal of 81213694847999 is 99974849631218.

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

It is a cyclic number.

It is not a de Polignac number, because 81213694847999 - 2⁴⁴ = 63621508803583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81213694847599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3335954 + ... + 13174064.

It is an arithmetic number, because the mean of its divisors is an integer number (11601967424256).

Almost surely, 2^{81213694847999} is an apocalyptic number.

81213694847999 is a deficient number, since it is larger than the sum of its proper divisors (11602044546049).

81213694847999 is a wasteful number, since it uses less digits than its factorization.

81213694847999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11017405.

The product of its digits is 1693052928, while the sum is 80.

The spelling of 81213694847999 in words is "eighty-one trillion, two hundred thirteen billion, six hundred ninety-four million, eight hundred forty-seven thousand, nine hundred ninety-nine".