166685333583 has 4 divisors (see below), whose sum is σ = 222247111448. Its totient is φ = 111123555720.

The previous prime is 166685333461. The next prime is 166685333593. The reversal of 166685333583 is 385333586661.

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

It is not a de Polignac number, because 166685333583 - 2²⁴ = 166668556367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166685333593) 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, 27780888928 + ... + 27780888933.

It is an arithmetic number, because the mean of its divisors is an integer number (55561777862).

Almost surely, 2^166685333583 is an apocalyptic number.

166685333583 is a deficient number, since it is larger than the sum of its proper divisors (55561777865).

166685333583 is an equidigital number, since it uses as much as digits as its factorization.

166685333583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55561777864.

The product of its digits is 27993600, while the sum is 57.

The spelling of 166685333583 in words is "one hundred sixty-six billion, six hundred eighty-five million, three hundred thirty-three thousand, five hundred eighty-three".