81730867166 has 16 divisors (see below), whose sum is σ = 136285715328. Its totient is φ = 36505101600.

The previous prime is 81730867151. The next prime is 81730867193. The reversal of 81730867166 is 66176803718.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 50700725 + ... + 50702336.

It is an arithmetic number, because the mean of its divisors is an integer number (8517857208).

Almost surely, 2^81730867166 is an apocalyptic number.

81730867166 is a deficient number, since it is larger than the sum of its proper divisors (54554848162).

81730867166 is a wasteful number, since it uses less digits than its factorization.

81730867166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101403107.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 81730867166 in words is "eighty-one billion, seven hundred thirty million, eight hundred sixty-seven thousand, one hundred sixty-six".