166215201517 has 8 divisors (see below), whose sum is σ = 172581258240. Its totient is φ = 159891444720.

The previous prime is 166215201479. The next prime is 166215201521. The reversal of 166215201517 is 715102512661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166215201517 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 (166215201527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10566973 + ... + 10582690.

It is an arithmetic number, because the mean of its divisors is an integer number (21572657280).

Almost surely, 2^166215201517 is an apocalyptic number.

It is an amenable number.

166215201517 is a deficient number, since it is larger than the sum of its proper divisors (6366056723).

166215201517 is a wasteful number, since it uses less digits than its factorization.

166215201517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21149963.

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 166215201517 in words is "one hundred sixty-six billion, two hundred fifteen million, two hundred one thousand, five hundred seventeen".