166013506 has 8 divisors (see below), whose sum is σ = 249335100. Its totient is φ = 82901808.

The previous prime is 166013503. The next prime is 166013521. The reversal of 166013506 is 605310661.

It can be written as a sum of positive squares in 2 ways, for example, as 158533281 + 7480225 = 12591^2 + 2735^2 .

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 (166013503) 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, 50481 + ... + 53668.

Almost surely, 2^166013506 is an apocalyptic number.

166013506 is a deficient number, since it is larger than the sum of its proper divisors (83321594).

166013506 is a wasteful number, since it uses less digits than its factorization.

166013506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104948.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 166013506 is about 12884.6228505145. The cubic root of 166013506 is about 549.6013706551.

The spelling of 166013506 in words is "one hundred sixty-six million, thirteen thousand, five hundred six".