166138466 has 8 divisors (see below), whose sum is σ = 268377564. Its totient is φ = 76679280.

The previous prime is 166138463. The next prime is 166138471. The reversal of 166138466 is 664831661.

It can be written as a sum of positive squares in 2 ways, for example, as 137569441 + 28569025 = 11729^2 + 5345^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166138463) 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 3 ways as a sum of consecutive naturals, for example, 3194945 + ... + 3194996.

Almost surely, 2^166138466 is an apocalyptic number.

166138466 is a deficient number, since it is larger than the sum of its proper divisors (102239098).

166138466 is a wasteful number, since it uses less digits than its factorization.

166138466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6389956.

The product of its digits is 124416, while the sum is 41.

The square root of 166138466 is about 12889.4711295693. The cubic root of 166138466 is about 549.7392328579.

The spelling of 166138466 in words is "one hundred sixty-six million, one hundred thirty-eight thousand, four hundred sixty-six".