166020215 has 32 divisors (see below), whose sum is σ = 223015680. Its totient is φ = 118042624.

The previous prime is 166020203. The next prime is 166020229. The reversal of 166020215 is 512020661.

It is a cyclic number.

It is not a de Polignac number, because 166020215 - 2⁴ = 166020199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115139 + ... + 116571.

It is an arithmetic number, because the mean of its divisors is an integer number (6969240).

Almost surely, 2^166020215 is an apocalyptic number.

166020215 is a deficient number, since it is larger than the sum of its proper divisors (56995465).

166020215 is a wasteful number, since it uses less digits than its factorization.

166020215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 166020215 is about 12884.8831969871. The cubic root of 166020215 is about 549.6087741209.

Adding to 166020215 its reverse (512020661), we get a palindrome (678040876).

The spelling of 166020215 in words is "one hundred sixty-six million, twenty thousand, two hundred fifteen".