81253443329 has 8 divisors (see below), whose sum is σ = 81738603360. Its totient is φ = 80768630656.

The previous prime is 81253443311. The next prime is 81253443347. The reversal of 81253443329 is 92334435218.

It is an interprime number because it is at equal distance from previous prime (81253443311) and next prime (81253443347).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81253443329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81253443329.

It is not an unprimeable number, because it can be changed into a prime (81253443529) 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, 390182 + ... + 561024.

It is an arithmetic number, because the mean of its divisors is an integer number (10217325420).

Almost surely, 2^81253443329 is an apocalyptic number.

It is an amenable number.

81253443329 is a deficient number, since it is larger than the sum of its proper divisors (485160031).

81253443329 is a wasteful number, since it uses less digits than its factorization.

81253443329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173679.

The product of its digits is 622080, while the sum is 44.

The spelling of 81253443329 in words is "eighty-one billion, two hundred fifty-three million, four hundred forty-three thousand, three hundred twenty-nine".