81963066504 has 64 divisors (see below), whose sum is σ = 228291747840. Its totient is φ = 24308836160.

The previous prime is 81963066491. The next prime is 81963066557. The reversal of 81963066504 is 40566036918.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3290424 + ... + 3315239.

It is an arithmetic number, because the mean of its divisors is an integer number (3567058560).

Almost surely, 2^81963066504 is an apocalyptic number.

It is an amenable number.

81963066504 is an abundant number, since it is smaller than the sum of its proper divisors (146328681336).

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

81963066504 is a wasteful number, since it uses less digits than its factorization.

81963066504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6605730 (or 6605726 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 81963066504 in words is "eighty-one billion, nine hundred sixty-three million, sixty-six thousand, five hundred four".