81962936108 has 12 divisors (see below), whose sum is σ = 144530063832. Its totient is φ = 40668632160.

The previous prime is 81962936101. The next prime is 81962936191. The reversal of 81962936108 is 80163926918.

It is a self number, because there is not a number n which added to its sum of digits gives 81962936108.

It is not an unprimeable number, because it can be changed into a prime (81962936101) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 78208385 + ... + 78209432.

It is an arithmetic number, because the mean of its divisors is an integer number (12044171986).

Almost surely, 2^81962936108 is an apocalyptic number.

It is an amenable number.

81962936108 is a deficient number, since it is larger than the sum of its proper divisors (62567127724).

81962936108 is a wasteful number, since it uses less digits than its factorization.

81962936108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156417952 (or 156417950 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 81962936108 in words is "eighty-one billion, nine hundred sixty-two million, nine hundred thirty-six thousand, one hundred eight".