181985166697 has 16 divisors (see below), whose sum is σ = 190146623040. Its totient is φ = 174037876992.

The previous prime is 181985166677. The next prime is 181985166707. The reversal of 181985166697 is 796661589181.

181985166697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 181985166697 - 2⁷ = 181985166569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181985166637) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 218454 + ... + 641632.

It is an arithmetic number, because the mean of its divisors is an integer number (11884163940).

Almost surely, 2^181985166697 is an apocalyptic number.

It is an amenable number.

181985166697 is a deficient number, since it is larger than the sum of its proper divisors (8161456343).

181985166697 is a wasteful number, since it uses less digits than its factorization.

181985166697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423432.

The product of its digits is 39191040, while the sum is 67.

The spelling of 181985166697 in words is "one hundred eighty-one billion, nine hundred eighty-five million, one hundred sixty-six thousand, six hundred ninety-seven".