81786636376 has 32 divisors (see below), whose sum is σ = 162271123200. Its totient is φ = 38564421280.

The previous prime is 81786636367. The next prime is 81786636397. The reversal of 81786636376 is 67363668718.

It is a congruent number.

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, 3117166 + ... + 3143293.

It is an arithmetic number, because the mean of its divisors is an integer number (5070972600).

Almost surely, 2^81786636376 is an apocalyptic number.

It is an amenable number.

81786636376 is a deficient number, since it is larger than the sum of its proper divisors (80484486824).

81786636376 is a wasteful number, since it uses less digits than its factorization.

81786636376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6260559 (or 6260555 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 61.

The spelling of 81786636376 in words is "eighty-one billion, seven hundred eighty-six million, six hundred thirty-six thousand, three hundred seventy-six".