166006013 has 4 divisors (see below), whose sum is σ = 170492700. Its totient is φ = 161519328.

The previous prime is 166005989. The next prime is 166006031. The reversal of 166006013 is 310600661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 140825689 + 25180324 = 11867^2 + 5018^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166006013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166006013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166006073) 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, 2243288 + ... + 2243361.

It is an arithmetic number, because the mean of its divisors is an integer number (42623175).

Almost surely, 2^166006013 is an apocalyptic number.

It is an amenable number.

166006013 is a deficient number, since it is larger than the sum of its proper divisors (4486687).

166006013 is an equidigital number, since it uses as much as digits as its factorization.

166006013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4486686.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 166006013 is about 12884.3320742676. The cubic root of 166006013 is about 549.5931017997.

Adding to 166006013 its reverse (310600661), we get a palindrome (476606674).

The spelling of 166006013 in words is "one hundred sixty-six million, six thousand, thirteen".