66166215 has 8 divisors (see below), whose sum is σ = 105865968. Its totient is φ = 35288640.

The previous prime is 66166201. The next prime is 66166223. The reversal of 66166215 is 51266166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66166215 - 2⁹ = 66165703 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2205526 + ... + 2205555.

It is an arithmetic number, because the mean of its divisors is an integer number (13233246).

Almost surely, 2^66166215 is an apocalyptic number.

66166215 is a deficient number, since it is larger than the sum of its proper divisors (39699753).

66166215 is a wasteful number, since it uses less digits than its factorization.

66166215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4411089.

The product of its digits is 12960, while the sum is 33.

The square root of 66166215 is about 8134.2617980982. The cubic root of 66166215 is about 404.4629675236.

The spelling of 66166215 in words is "sixty-six million, one hundred sixty-six thousand, two hundred fifteen".