166606513 has 4 divisors (see below), whose sum is σ = 168888868. Its totient is φ = 164324160.

The previous prime is 166606499. The next prime is 166606519. The reversal of 166606513 is 315606661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315606661 = 569 ⋅554669.

It can be written as a sum of positive squares in 2 ways, for example, as 50225569 + 116380944 = 7087^2 + 10788^2 .

It is a cyclic number.

It is not a de Polignac number, because 166606513 - 2¹³ = 166598321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166606519) 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, 1141068 + ... + 1141213.

It is an arithmetic number, because the mean of its divisors is an integer number (42222217).

Almost surely, 2^166606513 is an apocalyptic number.

It is an amenable number.

166606513 is a deficient number, since it is larger than the sum of its proper divisors (2282355).

166606513 is an equidigital number, since it uses as much as digits as its factorization.

166606513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282354.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 166606513 is about 12907.6145356142. The cubic root of 166606513 is about 550.2549925052.

The spelling of 166606513 in words is "one hundred sixty-six million, six hundred six thousand, five hundred thirteen".