666000071 has 4 divisors (see below), whose sum is σ = 726545544. Its totient is φ = 605454600.

The previous prime is 666000061. The next prime is 666000073. The reversal of 666000071 is 170000666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666000071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666000071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666000073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30272720 + ... + 30272741.

It is an arithmetic number, because the mean of its divisors is an integer number (181636386).

Almost surely, 2^666000071 is an apocalyptic number.

666000071 is a deficient number, since it is larger than the sum of its proper divisors (60545473).

666000071 is a wasteful number, since it uses less digits than its factorization.

666000071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60545472.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 666000071 is about 25806.9771767249. The cubic root of 666000071 is about 873.2892051624.

The spelling of 666000071 in words is "six hundred sixty-six million, seventy-one", and thus it is an aban number.