166702070217 has 4 divisors (see below), whose sum is σ = 222269426960. Its totient is φ = 111134713476.

The previous prime is 166702070189. The next prime is 166702070237. The reversal of 166702070217 is 712070207661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 166702070217 - 2⁷ = 166702070089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166702070237) 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, 27783678367 + ... + 27783678372.

It is an arithmetic number, because the mean of its divisors is an integer number (55567356740).

Almost surely, 2^166702070217 is an apocalyptic number.

It is an amenable number.

166702070217 is a deficient number, since it is larger than the sum of its proper divisors (55567356743).

166702070217 is an equidigital number, since it uses as much as digits as its factorization.

166702070217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55567356742.

The product of its (nonzero) digits is 49392, while the sum is 39.

Adding to 166702070217 its reverse (712070207661), we get a palindrome (878772277878).

The spelling of 166702070217 in words is "one hundred sixty-six billion, seven hundred two million, seventy thousand, two hundred seventeen".