81471232972 has 6 divisors (see below), whose sum is σ = 142574657708. Its totient is φ = 40735616484.

The previous prime is 81471232967. The next prime is 81471233009. The reversal of 81471232972 is 27923217418.

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 as a sum of consecutive naturals, namely, 10183904118 + ... + 10183904125.

Almost surely, 2^81471232972 is an apocalyptic number.

It is an amenable number.

81471232972 is a deficient number, since it is larger than the sum of its proper divisors (61103424736).

81471232972 is a wasteful number, since it uses less digits than its factorization.

81471232972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20367808247 (or 20367808245 counting only the distinct ones).

The product of its digits is 338688, while the sum is 46.

The spelling of 81471232972 in words is "eighty-one billion, four hundred seventy-one million, two hundred thirty-two thousand, nine hundred seventy-two".