666665323 has 16 divisors (see below), whose sum is σ = 705024000. Its totient is φ = 629497440.

The previous prime is 666665317. The next prime is 666665341. The reversal of 666665323 is 323566666.

It is a cyclic number.

It is not a de Polignac number, because 666665323 - 2²¹ = 664568171 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 666665323.

It is not an unprimeable number, because it can be changed into a prime (666665303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325938 + ... + 327976.

It is an arithmetic number, because the mean of its divisors is an integer number (44064000).

Almost surely, 2^666665323 is an apocalyptic number.

666665323 is a deficient number, since it is larger than the sum of its proper divisors (38358677).

666665323 is a wasteful number, since it uses less digits than its factorization.

666665323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322.

The product of its digits is 699840, while the sum is 43.

The square root of 666665323 is about 25819.8629547099. The cubic root of 666665323 is about 873.5798778354.

The spelling of 666665323 in words is "six hundred sixty-six million, six hundred sixty-five thousand, three hundred twenty-three".