66000161 has 4 divisors (see below), whose sum is σ = 66482052. Its totient is φ = 65518272.

The previous prime is 66000157. The next prime is 66000169. The reversal of 66000161 is 16100066.

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 43151761 + 22848400 = 6569^2 + 4780^2 .

It is a cyclic number.

It is not a de Polignac number, because 66000161 - 2² = 66000157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66000169) 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, 240740 + ... + 241013.

It is an arithmetic number, because the mean of its divisors is an integer number (16620513).

Almost surely, 2^66000161 is an apocalyptic number.

It is an amenable number.

66000161 is a deficient number, since it is larger than the sum of its proper divisors (481891).

66000161 is a wasteful number, since it uses less digits than its factorization.

66000161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481890.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 66000161 is about 8124.0483134949. The cubic root of 66000161 is about 404.1243306678.

The spelling of 66000161 in words is "sixty-six million, one hundred sixty-one", and thus it is an aban number.