666040006 has 4 divisors (see below), whose sum is σ = 999060012. Its totient is φ = 333020002.

The previous prime is 666039989. The next prime is 666040007. The reversal of 666040006 is 600040666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666040007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166510000 + ... + 166510003.

It is an arithmetic number, because the mean of its divisors is an integer number (249765003).

Almost surely, 2^666040006 is an apocalyptic number.

666040006 is a deficient number, since it is larger than the sum of its proper divisors (333020006).

666040006 is a wasteful number, since it uses less digits than its factorization.

666040006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333020005.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 666040006 is about 25807.7508899943. The cubic root of 666040006 is about 873.3066596687.

The spelling of 666040006 in words is "six hundred sixty-six million, forty thousand, six".