166420911 has 8 divisors (see below), whose sum is σ = 224049280. Its totient is φ = 109869912.

The previous prime is 166420909. The next prime is 166420913. The reversal of 166420911 is 119024661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (166420909) and next prime (166420913).

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

It is not a de Polignac number, because 166420911 - 2¹ = 166420909 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 (166420913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268981 + ... + 269598.

It is an arithmetic number, because the mean of its divisors is an integer number (28006160).

Almost surely, 2^166420911 is an apocalyptic number.

166420911 is a deficient number, since it is larger than the sum of its proper divisors (57628369).

166420911 is a wasteful number, since it uses less digits than its factorization.

166420911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538685.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 166420911 is about 12900.4229000448. The cubic root of 166420911 is about 550.0505859808.

It can be divided in two parts, 166420 and 911, that added together give a triangular number (167331 = T₅₇₈).

The spelling of 166420911 in words is "one hundred sixty-six million, four hundred twenty thousand, nine hundred eleven".