66264166 has 4 divisors (see below), whose sum is σ = 99396252. Its totient is φ = 33132082.

The previous prime is 66264131. The next prime is 66264169. The reversal of 66264166 is 66146266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66146266 = 2 ⋅33073133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66264169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16566040 + ... + 16566043.

It is an arithmetic number, because the mean of its divisors is an integer number (24849063).

Almost surely, 2^66264166 is an apocalyptic number.

66264166 is a deficient number, since it is larger than the sum of its proper divisors (33132086).

66264166 is a wasteful number, since it uses less digits than its factorization.

66264166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33132085.

The product of its digits is 62208, while the sum is 37.

The square root of 66264166 is about 8140.2804619988. The cubic root of 66264166 is about 404.6624551248.

It can be divided in two parts, 66264 and 166, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 66264166 in words is "sixty-six million, two hundred sixty-four thousand, one hundred sixty-six".