81208180876 has 12 divisors (see below), whose sum is σ = 142306627960. Its totient is φ = 40549144320.

The previous prime is 81208180873. The next prime is 81208180883. The reversal of 81208180876 is 67808180218.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81208180873) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13733205 + ... + 13739116.

Almost surely, 2^81208180876 is an apocalyptic number.

It is an amenable number.

81208180876 is a deficient number, since it is larger than the sum of its proper divisors (61098447084).

81208180876 is a wasteful number, since it uses less digits than its factorization.

81208180876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27473064 (or 27473062 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 49.

The spelling of 81208180876 in words is "eighty-one billion, two hundred eight million, one hundred eighty thousand, eight hundred seventy-six".