81800067702 has 16 divisors (see below), whose sum is σ = 163611486720. Its totient is φ = 27264797352.

The previous prime is 81800067689. The next prime is 81800067719. The reversal of 81800067702 is 20776000818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377818 + ... + 553485.

It is an arithmetic number, because the mean of its divisors is an integer number (10225717920).

Almost surely, 2^81800067702 is an apocalyptic number.

81800067702 is an abundant number, since it is smaller than the sum of its proper divisors (81811419018).

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

81800067702 is a wasteful number, since it uses less digits than its factorization.

81800067702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945947.

The product of its (nonzero) digits is 37632, while the sum is 39.

The spelling of 81800067702 in words is "eighty-one billion, eight hundred million, sixty-seven thousand, seven hundred two".