166664653 has 4 divisors (see below), whose sum is σ = 172411740. Its totient is φ = 160917568.

The previous prime is 166664633. The next prime is 166664677. The reversal of 166664653 is 356466661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 139759684 + 26904969 = 11822^2 + 5187^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166664653 is a prime.

It is a super-2 number, since 2×166664653² = 55554213119220818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166664633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2873500 + ... + 2873557.

It is an arithmetic number, because the mean of its divisors is an integer number (43102935).

Almost surely, 2^166664653 is an apocalyptic number.

It is an amenable number.

166664653 is a deficient number, since it is larger than the sum of its proper divisors (5747087).

166664653 is an equidigital number, since it uses as much as digits as its factorization.

166664653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5747086.

The product of its digits is 466560, while the sum is 43.

The square root of 166664653 is about 12909.8664981478. The cubic root of 166664653 is about 550.3189918132.

The spelling of 166664653 in words is "one hundred sixty-six million, six hundred sixty-four thousand, six hundred fifty-three".