166220740 has 144 divisors (see below), whose sum is σ = 436665600. Its totient is φ = 52835328.

The previous prime is 166220737. The next prime is 166220771. The reversal of 166220740 is 47022661.

It is a super-2 number, since 2×166220740² = 55258668812295200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 166220699 and 166220708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1470924 + ... + 1471036.

It is an arithmetic number, because the mean of its divisors is an integer number (3032400).

Almost surely, 2^166220740 is an apocalyptic number.

166220740 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 166220740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218332800).

166220740 is an abundant number, since it is smaller than the sum of its proper divisors (270444860).

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

166220740 is a wasteful number, since it uses less digits than its factorization.

166220740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 166220740 is about 12892.6622541661. The cubic root of 166220740 is about 549.8299639666.

The spelling of 166220740 in words is "one hundred sixty-six million, two hundred twenty thousand, seven hundred forty".