81081204272 has 20 divisors (see below), whose sum is σ = 157099859400. Its totient is φ = 40539305088.

The previous prime is 81081204271. The next prime is 81081204283. The reversal of 81081204272 is 27240218018.

It is not an unprimeable number, because it can be changed into a prime (81081204271) by changing a digit.

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, 616604 + ... + 736452.

It is an arithmetic number, because the mean of its divisors is an integer number (7854992970).

Almost surely, 2^81081204272 is an apocalyptic number.

It is an amenable number.

81081204272 is a deficient number, since it is larger than the sum of its proper divisors (76018655128).

81081204272 is a wasteful number, since it uses less digits than its factorization.

81081204272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162140 (or 162134 counting only the distinct ones).

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

The spelling of 81081204272 in words is "eighty-one billion, eighty-one million, two hundred four thousand, two hundred seventy-two".