81963196582 has 8 divisors (see below), whose sum is σ = 122956032096. Its totient is φ = 40977852552.

The previous prime is 81963196561. The next prime is 81963196591. The reversal of 81963196582 is 28569136918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1845438 + ... + 1889329.

It is an arithmetic number, because the mean of its divisors is an integer number (15369504012).

Almost surely, 2^81963196582 is an apocalyptic number.

81963196582 is a deficient number, since it is larger than the sum of its proper divisors (40992835514).

81963196582 is a wasteful number, since it uses less digits than its factorization.

81963196582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3745742.

The product of its digits is 5598720, while the sum is 58.

The spelling of 81963196582 in words is "eighty-one billion, nine hundred sixty-three million, one hundred ninety-six thousand, five hundred eighty-two".