81274200812 has 24 divisors (see below), whose sum is σ = 162882203904. Its totient is φ = 34760271312.

The previous prime is 81274200779. The next prime is 81274200869. The reversal of 81274200812 is 21800247218.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2966498 + ... + 2993769.

It is an arithmetic number, because the mean of its divisors is an integer number (6786758496).

Almost surely, 2^81274200812 is an apocalyptic number.

It is an amenable number.

81274200812 is an abundant number, since it is smaller than the sum of its proper divisors (81608003092).

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

81274200812 is a wasteful number, since it uses less digits than its factorization.

81274200812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5960765 (or 5960763 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 35.

The spelling of 81274200812 in words is "eighty-one billion, two hundred seventy-four million, two hundred thousand, eight hundred twelve".