166422120 has 128 divisors (see below), whose sum is σ = 515082240. Its totient is φ = 42997760.

The previous prime is 166422119. The next prime is 166422127. The reversal of 166422120 is 21224661.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (166422127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 871225 + ... + 871415.

It is an arithmetic number, because the mean of its divisors is an integer number (4024080).

Almost surely, 2^166422120 is an apocalyptic number.

166422120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166422120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257541120).

166422120 is an abundant number, since it is smaller than the sum of its proper divisors (348660120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166422120 is a wasteful number, since it uses less digits than its factorization.

166422120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 166422120 is about 12900.4697588886. The cubic root of 166422120 is about 550.0519179640.

Adding to 166422120 its reverse (21224661), we get a palindrome (187646781).

The spelling of 166422120 in words is "one hundred sixty-six million, four hundred twenty-two thousand, one hundred twenty".