81786636332 has 24 divisors (see below), whose sum is σ = 143317902336. Its totient is φ = 40838704848.

The previous prime is 81786636329. The next prime is 81786636367. The reversal of 81786636332 is 23363668718.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12842213 + ... + 12848579.

It is an arithmetic number, because the mean of its divisors is an integer number (5971579264).

Almost surely, 2^81786636332 is an apocalyptic number.

It is an amenable number.

81786636332 is a deficient number, since it is larger than the sum of its proper divisors (61531266004).

81786636332 is a wasteful number, since it uses less digits than its factorization.

81786636332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10157 (or 10155 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 53.

The spelling of 81786636332 in words is "eighty-one billion, seven hundred eighty-six million, six hundred thirty-six thousand, three hundred thirty-two".