81969344897 has 8 divisors (see below), whose sum is σ = 89519271552. Its totient is φ = 74435779600.

The previous prime is 81969344851. The next prime is 81969344939. The reversal of 81969344897 is 79844396918.

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 81969344897 - 2¹² = 81969340801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81969346897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4079858 + ... + 4099899.

It is an arithmetic number, because the mean of its divisors is an integer number (11189908944).

Almost surely, 2^81969344897 is an apocalyptic number.

It is an amenable number.

81969344897 is a deficient number, since it is larger than the sum of its proper divisors (7549926655).

81969344897 is a wasteful number, since it uses less digits than its factorization.

81969344897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8180679.

The product of its digits is 94058496, while the sum is 68.

The spelling of 81969344897 in words is "eighty-one billion, nine hundred sixty-nine million, three hundred forty-four thousand, eight hundred ninety-seven".