66840166 has 4 divisors (see below), whose sum is σ = 100260252. Its totient is φ = 33420082.

The previous prime is 66840161. The next prime is 66840173. The reversal of 66840166 is 66104866.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66840161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16710040 + ... + 16710043.

It is an arithmetic number, because the mean of its divisors is an integer number (25065063).

Almost surely, 2^66840166 is an apocalyptic number.

66840166 is a deficient number, since it is larger than the sum of its proper divisors (33420086).

66840166 is a wasteful number, since it uses less digits than its factorization.

66840166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33420085.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 66840166 is about 8175.5835265747. The cubic root of 66840166 is about 405.8315809982.

The spelling of 66840166 in words is "sixty-six million, eight hundred forty thousand, one hundred sixty-six".