166117973 has 4 divisors (see below), whose sum is σ = 189849120. Its totient is φ = 142386828.

The previous prime is 166117949. The next prime is 166118011. The reversal of 166117973 is 379711661.

It is a happy number.

166117973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 379711661 = 7 ⋅54244523.

It is a cyclic number.

It is not a de Polignac number, because 166117973 - 2⁸ = 166117717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166117973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166117873) 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, 11865563 + ... + 11865576.

It is an arithmetic number, because the mean of its divisors is an integer number (47462280).

Almost surely, 2^166117973 is an apocalyptic number.

It is an amenable number.

166117973 is a deficient number, since it is larger than the sum of its proper divisors (23731147).

166117973 is an equidigital number, since it uses as much as digits as its factorization.

166117973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23731146.

The product of its digits is 47628, while the sum is 41.

The square root of 166117973 is about 12888.6761538957. The cubic root of 166117973 is about 549.7166286820.

The spelling of 166117973 in words is "one hundred sixty-six million, one hundred seventeen thousand, nine hundred seventy-three".