166683335187 has 4 divisors (see below), whose sum is σ = 222244446920. Its totient is φ = 111122223456.

The previous prime is 166683335141. The next prime is 166683335201. The reversal of 166683335187 is 781533386661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 166683335187 - 2⁸ = 166683334931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166683335587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27780555862 + ... + 27780555867.

It is an arithmetic number, because the mean of its divisors is an integer number (55561111730).

Almost surely, 2^166683335187 is an apocalyptic number.

166683335187 is a deficient number, since it is larger than the sum of its proper divisors (55561111733).

166683335187 is an equidigital number, since it uses as much as digits as its factorization.

166683335187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55561111732.

The product of its digits is 13063680, while the sum is 57.

The spelling of 166683335187 in words is "one hundred sixty-six billion, six hundred eighty-three million, three hundred thirty-five thousand, one hundred eighty-seven".