81865304630 has 16 divisors (see below), whose sum is σ = 147373732800. Its totient is φ = 32742525312.

The previous prime is 81865304611. The next prime is 81865304657. The reversal of 81865304630 is 3640356818.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352979 + ... + 536958.

It is an arithmetic number, because the mean of its divisors is an integer number (9210858300).

Almost surely, 2^81865304630 is an apocalyptic number.

81865304630 is a deficient number, since it is larger than the sum of its proper divisors (65508428170).

81865304630 is a wasteful number, since it uses less digits than its factorization.

81865304630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899143.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 81865304630 in words is "eighty-one billion, eight hundred sixty-five million, three hundred four thousand, six hundred thirty".