166075138 has 4 divisors (see below), whose sum is σ = 249112710. Its totient is φ = 83037568.

The previous prime is 166075103. The next prime is 166075139. The reversal of 166075138 is 831570661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 84768849 + 81306289 = 9207^2 + 9017^2 .

It is a junction number, because it is equal to n+sod(n) for n = 166075097 and 166075106.

It is not an unprimeable number, because it can be changed into a prime (166075139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41518783 + ... + 41518786.

Almost surely, 2^166075138 is an apocalyptic number.

166075138 is a deficient number, since it is larger than the sum of its proper divisors (83037572).

166075138 is an equidigital number, since it uses as much as digits as its factorization.

166075138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83037571.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 166075138 is about 12887.0143167454. The cubic root of 166075138 is about 549.6693748426.

The spelling of 166075138 in words is "one hundred sixty-six million, seventy-five thousand, one hundred thirty-eight".