81704784816 has 30 divisors (see below), whose sum is σ = 228659919020. Its totient is φ = 27234928224.

The previous prime is 81704784797. The next prime is 81704784823. The reversal of 81704784816 is 61848740718.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

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 in 5 ways as a sum of consecutive naturals, for example, 283697026 + ... + 283697313.

Almost surely, 2^81704784816 is an apocalyptic number.

It is an amenable number.

81704784816 is an abundant number, since it is smaller than the sum of its proper divisors (146955134204).

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

81704784816 is a wasteful number, since it uses less digits than its factorization.

81704784816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567394353 (or 567394344 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 54.

The spelling of 81704784816 in words is "eighty-one billion, seven hundred four million, seven hundred eighty-four thousand, eight hundred sixteen".