166472976121 has 3 divisors (see below), whose sum is σ = 166473384133. Its totient is φ = 166472568110.

The previous prime is 166472976101. The next prime is 166472976133. The reversal of 166472976121 is 121679274661.

The square root of 166472976121 is 408011.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 166472976121 - 2¹⁹ = 166472451833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166472976101) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 204006 + ... + 612016.

Almost surely, 2^166472976121 is an apocalyptic number.

166472976121 is the 408011-st square number.

166472976121 is the 204006-th centered octagonal number.

It is an amenable number.

166472976121 is a deficient number, since it is larger than the sum of its proper divisors (408012).

166472976121 is an frugal number, since it uses more digits than its factorization.

166472976121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816022 (or 408011 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 52.

The spelling of 166472976121 in words is "one hundred sixty-six billion, four hundred seventy-two million, nine hundred seventy-six thousand, one hundred twenty-one".