666705323 has 4 divisors (see below), whose sum is σ = 666758640. Its totient is φ = 666652008.

The previous prime is 666705271. The next prime is 666705341. The reversal of 666705323 is 323507666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666705323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666705373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3386 + ... + 36672.

It is an arithmetic number, because the mean of its divisors is an integer number (166689660).

Almost surely, 2^666705323 is an apocalyptic number.

666705323 is a deficient number, since it is larger than the sum of its proper divisors (53317).

666705323 is a wasteful number, since it uses less digits than its factorization.

666705323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53316.

The product of its (nonzero) digits is 136080, while the sum is 38.

The square root of 666705323 is about 25820.6375405411. The cubic root of 666705323 is about 873.5973491188.

The spelling of 666705323 in words is "six hundred sixty-six million, seven hundred five thousand, three hundred twenty-three".