166443750 has 144 divisors (see below), whose sum is σ = 493562160. Its totient is φ = 40200000.

The previous prime is 166443749. The next prime is 166443751. The reversal of 166443750 is 57344661.

It is a happy number.

166443750 is a `hidden beast` number, since 1 + 6 + 644 + 3 + 7 + 5 + 0 = 666.

166443750 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (166443749) and next prime (166443751).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166443751) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 618616 + ... + 618884.

It is an arithmetic number, because the mean of its divisors is an integer number (3427515).

Almost surely, 2^166443750 is an apocalyptic number.

166443750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166443750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246781080).

166443750 is an abundant number, since it is smaller than the sum of its proper divisors (327118410).

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

166443750 is a wasteful number, since it uses less digits than its factorization.

166443750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 166443750 is about 12901.3080732149. The cubic root of 166443750 is about 550.0757471432.

The spelling of 166443750 in words is "one hundred sixty-six million, four hundred forty-three thousand, seven hundred fifty".