166238613 has 6 divisors (see below), whose sum is σ = 240122454. Its totient is φ = 110825736.

The previous prime is 166238609. The next prime is 166238617. The reversal of 166238613 is 316832661.

166238613 is a `hidden beast` number, since 1 + 6 + 6 + 2 + 38 + 613 = 666.

166238613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (166238609) and next prime (166238617).

It can be written as a sum of positive squares in only one way, i.e., 130919364 + 35319249 = 11442^2 + 5943^2 .

It is not a de Polignac number, because 166238613 - 2² = 166238609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166238617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9235470 + ... + 9235487.

It is an arithmetic number, because the mean of its divisors is an integer number (40020409).

Almost surely, 2^166238613 is an apocalyptic number.

It is an amenable number.

166238613 is a deficient number, since it is larger than the sum of its proper divisors (73883841).

166238613 is a wasteful number, since it uses less digits than its factorization.

166238613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18470963 (or 18470960 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 166238613 is about 12893.3553817461. The cubic root of 166238613 is about 549.8496702093.

The spelling of 166238613 in words is "one hundred sixty-six million, two hundred thirty-eight thousand, six hundred thirteen".