81943328315 has 16 divisors (see below), whose sum is σ = 102627053568. Its totient is φ = 62692387296.

The previous prime is 81943328309. The next prime is 81943328339. The reversal of 81943328315 is 51382334918.

It is a cyclic number.

It is not a de Polignac number, because 81943328315 - 2³⁰ = 80869586491 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 81943328315.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 555914 + ... + 687696.

It is an arithmetic number, because the mean of its divisors is an integer number (6414190848).

Almost surely, 2^81943328315 is an apocalyptic number.

81943328315 is a deficient number, since it is larger than the sum of its proper divisors (20683725253).

81943328315 is a wasteful number, since it uses less digits than its factorization.

81943328315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137218.

The product of its digits is 622080, while the sum is 47.

It can be divided in two parts, 819433 and 28315, that added together give a palindrome (847748).

The spelling of 81943328315 in words is "eighty-one billion, nine hundred forty-three million, three hundred twenty-eight thousand, three hundred fifteen".