166746438 has 80 divisors (see below), whose sum is σ = 398939904. Its totient is φ = 51874560.

The previous prime is 166746407. The next prime is 166746439. The reversal of 166746438 is 834647661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 166746393 and 166746402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166746439) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 525856 + ... + 526172.

Almost surely, 2^166746438 is an apocalyptic number.

166746438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166746438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199469952).

166746438 is an abundant number, since it is smaller than the sum of its proper divisors (232193466).

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

166746438 is a wasteful number, since it uses less digits than its factorization.

166746438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539 (or 530 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 166746438 is about 12913.0336482176. The cubic root of 166746438 is about 550.4089938581.

The spelling of 166746438 in words is "one hundred sixty-six million, seven hundred forty-six thousand, four hundred thirty-eight".