166662215 has 4 divisors (see below), whose sum is σ = 199994664. Its totient is φ = 133329768.

The previous prime is 166662211. The next prime is 166662229. The reversal of 166662215 is 512266661.

166662215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 166662215 - 2² = 166662211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166662211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16666217 + ... + 16666226.

It is an arithmetic number, because the mean of its divisors is an integer number (49998666).

Almost surely, 2^166662215 is an apocalyptic number.

166662215 is a deficient number, since it is larger than the sum of its proper divisors (33332449).

166662215 is an equidigital number, since it uses as much as digits as its factorization.

166662215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33332448.

The product of its digits is 25920, while the sum is 35.

The square root of 166662215 is about 12909.7720738981. The cubic root of 166662215 is about 550.3163084123.

It can be divided in two parts, 16666 and 2215, that added together give a palindrome (18881).

The spelling of 166662215 in words is "one hundred sixty-six million, six hundred sixty-two thousand, two hundred fifteen".