166422361 has 4 divisors (see below), whose sum is σ = 190196992. Its totient is φ = 142647732.

The previous prime is 166422359. The next prime is 166422371. The reversal of 166422361 is 163224661.

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 a cyclic number.

It is not a de Polignac number, because 166422361 - 2¹ = 166422359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166422301) 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 3 ways as a sum of consecutive naturals, for example, 11887305 + ... + 11887318.

It is an arithmetic number, because the mean of its divisors is an integer number (47549248).

Almost surely, 2^166422361 is an apocalyptic number.

It is an amenable number.

166422361 is a deficient number, since it is larger than the sum of its proper divisors (23774631).

166422361 is an equidigital number, since it uses as much as digits as its factorization.

166422361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23774630.

The product of its digits is 10368, while the sum is 31.

The square root of 166422361 is about 12900.4790996304. The cubic root of 166422361 is about 550.0521834785.

It can be divided in two parts, 1664 and 22361, that added together give a square (24025 = 155²).

The spelling of 166422361 in words is "one hundred sixty-six million, four hundred twenty-two thousand, three hundred sixty-one".