66000188243 has 4 divisors (see below), whose sum is σ = 72000205368. Its totient is φ = 60000171120.

The previous prime is 66000188201. The next prime is 66000188251. The reversal of 66000188243 is 34288100066.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66000188243 - 2⁸ = 66000187987 is a prime.

It is a super-2 number, since 2×66000188243² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66000188197 and 66000188206.

It is not an unprimeable number, because it can be changed into a prime (66000188273) 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, 3000008546 + ... + 3000008567.

It is an arithmetic number, because the mean of its divisors is an integer number (18000051342).

Almost surely, 2^66000188243 is an apocalyptic number.

66000188243 is a deficient number, since it is larger than the sum of its proper divisors (6000017125).

66000188243 is a wasteful number, since it uses less digits than its factorization.

66000188243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6000017124.

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 66000188243 in words is "sixty-six billion, one hundred eighty-eight thousand, two hundred forty-three".