81600000008 has 16 divisors (see below), whose sum is σ = 153016162560. Its totient is φ = 40795690000.

The previous prime is 81599999993. The next prime is 81600000019. The reversal of 81600000008 is 80000000618.

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, 457568 + ... + 610383.

It is an arithmetic number, because the mean of its divisors is an integer number (9563510160).

Almost surely, 2^81600000008 is an apocalyptic number.

It is an amenable number.

81600000008 is a deficient number, since it is larger than the sum of its proper divisors (71416162552).

81600000008 is a wasteful number, since it uses less digits than its factorization.

81600000008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077508 (or 1077504 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The spelling of 81600000008 in words is "eighty-one billion, six hundred million, eight", and thus it is an aban number.