81373343671 has 8 divisors (see below), whose sum is σ = 82989948384. Its totient is φ = 79759748640.

The previous prime is 81373343669. The next prime is 81373343687. The reversal of 81373343671 is 17634337318.

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 81373343671 - 2¹ = 81373343669 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 (81373349671) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 697771 + ... + 805996.

It is an arithmetic number, because the mean of its divisors is an integer number (10373743548).

Almost surely, 2^81373343671 is an apocalyptic number.

81373343671 is a deficient number, since it is larger than the sum of its proper divisors (1616604713).

81373343671 is a wasteful number, since it uses less digits than its factorization.

81373343671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504841.

The product of its digits is 762048, while the sum is 46.

The spelling of 81373343671 in words is "eighty-one billion, three hundred seventy-three million, three hundred forty-three thousand, six hundred seventy-one".