185000001666 has 16 divisors (see below), whose sum is σ = 371008182144. Its totient is φ = 61498637424.

The previous prime is 185000001661. The next prime is 185000001707. The reversal of 185000001666 is 666100000581.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (185000001661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42005065 + ... + 42009468.

It is an arithmetic number, because the mean of its divisors is an integer number (23188011384).

Almost surely, 2^185000001666 is an apocalyptic number.

185000001666 is an abundant number, since it is smaller than the sum of its proper divisors (186008180478).

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

185000001666 is a wasteful number, since it uses less digits than its factorization.

185000001666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84014905.

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 185000001666 in words is "one hundred eighty-five billion, one thousand, six hundred sixty-six".