166620740 has 192 divisors, whose sum is σ = 457228800. Its totient is φ = 50012160.

The previous prime is 166620739. The next prime is 166620787. The reversal of 166620740 is 47026661.

166620740 = T₆₅ + T₆₆ + ... + T₉₉₉.

It is a junction number, because it is equal to n+sod(n) for n = 166620697 and 166620706.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1118186 + ... + 1118334.

It is an arithmetic number, because the mean of its divisors is an integer number (2381400).

Almost surely, 2^166620740 is an apocalyptic number.

166620740 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 166620740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228614400).

166620740 is an abundant number, since it is smaller than the sum of its proper divisors (290608060).

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

166620740 is a wasteful number, since it uses less digits than its factorization.

166620740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 166620740 is about 12908.1656326528. The cubic root of 166620740 is about 550.2706546679.

The spelling of 166620740 in words is "one hundred sixty-six million, six hundred twenty thousand, seven hundred forty".