166851850187 has 16 divisors (see below), whose sum is σ = 190036392192. Its totient is φ = 145010442720.

The previous prime is 166851850163. The next prime is 166851850237. The reversal of 166851850187 is 781058158661.

It is not a de Polignac number, because 166851850187 - 2²² = 166847655883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166851850127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295733 + ... + 648969.

It is an arithmetic number, because the mean of its divisors is an integer number (11877274512).

Almost surely, 2^166851850187 is an apocalyptic number.

166851850187 is a deficient number, since it is larger than the sum of its proper divisors (23184542005).

166851850187 is a wasteful number, since it uses less digits than its factorization.

166851850187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355138.

The product of its (nonzero) digits is 3225600, while the sum is 56.

The spelling of 166851850187 in words is "one hundred sixty-six billion, eight hundred fifty-one million, eight hundred fifty thousand, one hundred eighty-seven".