81213701704 has 16 divisors (see below), whose sum is σ = 152315579520. Its totient is φ = 40596213840.

The previous prime is 81213701689. The next prime is 81213701711. The reversal of 81213701704 is 40710731218.

It is a self number, because there is not a number n which added to its sum of digits gives 81213701704.

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 3 ways as a sum of consecutive naturals, for example, 1297132 + ... + 1358299.

It is an arithmetic number, because the mean of its divisors is an integer number (9519723720).

Almost surely, 2^81213701704 is an apocalyptic number.

It is an amenable number.

81213701704 is a deficient number, since it is larger than the sum of its proper divisors (71101877816).

81213701704 is a wasteful number, since it uses less digits than its factorization.

81213701704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659260 (or 2659256 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The spelling of 81213701704 in words is "eighty-one billion, two hundred thirteen million, seven hundred one thousand, seven hundred four".