66168645 has 16 divisors (see below), whose sum is σ = 107868672. Its totient is φ = 34623680.

The previous prime is 66168623. The next prime is 66168649. The reversal of 66168645 is 54686166.

It is a de Polignac number, because none of the positive numbers 2^k-66168645 is a prime.

It is a super-2 number, since 2×66168645² = 8756579162272050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66168597 and 66168606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66168649) 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, 40821 + ... + 42410.

It is an arithmetic number, because the mean of its divisors is an integer number (6741792).

Almost surely, 2^66168645 is an apocalyptic number.

It is an amenable number.

66168645 is a deficient number, since it is larger than the sum of its proper divisors (41700027).

66168645 is a wasteful number, since it uses less digits than its factorization.

66168645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83292.

The product of its digits is 207360, while the sum is 42.

The square root of 66168645 is about 8134.4111649215. The cubic root of 66168645 is about 404.4679188570.

The spelling of 66168645 in words is "sixty-six million, one hundred sixty-eight thousand, six hundred forty-five".