81751663204 has 24 divisors (see below), whose sum is σ = 152057272640. Its totient is φ = 38348502624.

The previous prime is 81751663199. The next prime is 81751663241. The reversal of 81751663204 is 40236615718.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5213919 + ... + 5229574.

Almost surely, 2^81751663204 is an apocalyptic number.

It is an amenable number.

81751663204 is a deficient number, since it is larger than the sum of its proper divisors (70305609436).

81751663204 is a wasteful number, since it uses less digits than its factorization.

81751663204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10443619 (or 10443617 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 81751663204 in words is "eighty-one billion, seven hundred fifty-one million, six hundred sixty-three thousand, two hundred four".