81541843828 has 12 divisors (see below), whose sum is σ = 142700488000. Its totient is φ = 40770275832.

The previous prime is 81541843759. The next prime is 81541843843. The reversal of 81541843828 is 82834814518.

It is a congruent number.

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, 225475 + ... + 462517.

Almost surely, 2^81541843828 is an apocalyptic number.

It is an amenable number.

81541843828 is a deficient number, since it is larger than the sum of its proper divisors (61158644172).

81541843828 is a wasteful number, since it uses less digits than its factorization.

81541843828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323046 (or 323044 counting only the distinct ones).

The product of its digits is 1966080, while the sum is 52.

The spelling of 81541843828 in words is "eighty-one billion, five hundred forty-one million, eight hundred forty-three thousand, eight hundred twenty-eight".