81643162266924 has 12 divisors (see below), whose sum is σ = 190500711956184. Its totient is φ = 27214387422304.

The previous prime is 81643162266823. The next prime is 81643162266961. The reversal of 81643162266924 is 42966226134618.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×81643162266924³ (a number of 43 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3401798427777 + ... + 3401798427800.

It is an arithmetic number, because the mean of its divisors is an integer number (15875059329682).

Almost surely, 2^{81643162266924} is an apocalyptic number.

It is an amenable number.

81643162266924 is an abundant number, since it is smaller than the sum of its proper divisors (108857549689260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81643162266924 is a wasteful number, since it uses less digits than its factorization.

81643162266924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6803596855584 (or 6803596855582 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 60.

The spelling of 81643162266924 in words is "eighty-one trillion, six hundred forty-three billion, one hundred sixty-two million, two hundred sixty-six thousand, nine hundred twenty-four".