166658738 has 8 divisors (see below), whose sum is σ = 252415488. Its totient is φ = 82520244.

The previous prime is 166658731. The next prime is 166658741. The reversal of 166658738 is 837856661.

It is a happy number.

166658738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (166658731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404306 + ... + 404717.

It is an arithmetic number, because the mean of its divisors is an integer number (31551936).

Almost surely, 2^166658738 is an apocalyptic number.

166658738 is a deficient number, since it is larger than the sum of its proper divisors (85756750).

166658738 is a wasteful number, since it uses less digits than its factorization.

166658738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809128.

The product of its digits is 1451520, while the sum is 50.

The square root of 166658738 is about 12909.6374077663. The cubic root of 166658738 is about 550.3124813839.

The spelling of 166658738 in words is "one hundred sixty-six million, six hundred fifty-eight thousand, seven hundred thirty-eight".