81582186020 has 48 divisors (see below), whose sum is σ = 180961955328. Its totient is φ = 30845767680.

The previous prime is 81582185981. The next prime is 81582186029. The reversal of 81582186020 is 2068128518.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81582186029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1503389 + ... + 1556708.

It is an arithmetic number, because the mean of its divisors is an integer number (3770040736).

Almost surely, 2^81582186020 is an apocalyptic number.

It is an amenable number.

81582186020 is an abundant number, since it is smaller than the sum of its proper divisors (99379769308).

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

81582186020 is a wasteful number, since it uses less digits than its factorization.

81582186020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060180 (or 3060178 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 41.

The spelling of 81582186020 in words is "eighty-one billion, five hundred eighty-two million, one hundred eighty-six thousand, twenty".