6666145206 has 16 divisors (see below), whose sum is σ = 15236903424. Its totient is φ = 1904612904.

The previous prime is 6666145201. The next prime is 6666145237. The reversal of 6666145206 is 6025416666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 158717743 = 6666145206 / (6 + 6 + 6 + 6 + 1 + 4 + 5 + 2 + 0 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666145201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79358830 + ... + 79358913.

It is an arithmetic number, because the mean of its divisors is an integer number (952306464).

Almost surely, 2^6666145206 is an apocalyptic number.

6666145206 is an abundant number, since it is smaller than the sum of its proper divisors (8570758218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6666145206 is a wasteful number, since it uses less digits than its factorization.

6666145206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158717755.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 6666145206 is about 81646.4647489406. The cubic root of 6666145206 is about 1882.0229851551.

The spelling of 6666145206 in words is "six billion, six hundred sixty-six million, one hundred forty-five thousand, two hundred six".