166538738 has 8 divisors (see below), whose sum is σ = 250344432. Its totient is φ = 83090596.

The previous prime is 166538737. The next prime is 166538747. The reversal of 166538738 is 837835661.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166538692 and 166538701.

It is not an unprimeable number, because it can be changed into a prime (166538731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88220 + ... + 90087.

It is an arithmetic number, because the mean of its divisors is an integer number (31293054).

Almost surely, 2^166538738 is an apocalyptic number.

166538738 is a deficient number, since it is larger than the sum of its proper divisors (83805694).

166538738 is a wasteful number, since it uses less digits than its factorization.

166538738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178776.

The product of its digits is 725760, while the sum is 47.

The square root of 166538738 is about 12904.9888802742. The cubic root of 166538738 is about 550.1803683913.

The spelling of 166538738 in words is "one hundred sixty-six million, five hundred thirty-eight thousand, seven hundred thirty-eight".