166121422115 has 24 divisors (see below), whose sum is σ = 223249827024. Its totient is φ = 118536017600.

The previous prime is 166121422109. The next prime is 166121422133. The reversal of 166121422115 is 511224121661.

It is a happy number.

It is not a de Polignac number, because 166121422115 - 2⁴ = 166121422099 is a prime.

It is a super-2 number, since 2×166121422115² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2558321 + ... + 2622450.

It is an arithmetic number, because the mean of its divisors is an integer number (9302076126).

Almost surely, 2^166121422115 is an apocalyptic number.

166121422115 is a deficient number, since it is larger than the sum of its proper divisors (57128404909).

166121422115 is a wasteful number, since it uses less digits than its factorization.

166121422115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180851 (or 5180840 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

Adding to 166121422115 its reverse (511224121661), we get a palindrome (677345543776).

The spelling of 166121422115 in words is "one hundred sixty-six billion, one hundred twenty-one million, four hundred twenty-two thousand, one hundred fifteen".