81968388204 has 12 divisors (see below), whose sum is σ = 191259572504. Its totient is φ = 27322796064.

The previous prime is 81968388199. The next prime is 81968388223. The reversal of 81968388204 is 40288386918.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3415349497 + ... + 3415349520.

Almost surely, 2^81968388204 is an apocalyptic number.

It is an amenable number.

81968388204 is an abundant number, since it is smaller than the sum of its proper divisors (109291184300).

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

81968388204 is a wasteful number, since it uses less digits than its factorization.

81968388204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6830699024 (or 6830699022 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 57.

The spelling of 81968388204 in words is "eighty-one billion, nine hundred sixty-eight million, three hundred eighty-eight thousand, two hundred four".