666873365 has 32 divisors (see below), whose sum is σ = 876718080. Its totient is φ = 484982784.

The previous prime is 666873359. The next prime is 666873367. The reversal of 666873365 is 563378666.

It is a cyclic number.

It is not a de Polignac number, because 666873365 - 2¹⁸ = 666611221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666873367) 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 31 ways as a sum of consecutive naturals, for example, 314549 + ... + 316661.

It is an arithmetic number, because the mean of its divisors is an integer number (27397440).

Almost surely, 2^666873365 is an apocalyptic number.

It is an amenable number.

666873365 is a deficient number, since it is larger than the sum of its proper divisors (209844715).

666873365 is a wasteful number, since it uses less digits than its factorization.

666873365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261.

The product of its digits is 3265920, while the sum is 50.

The square root of 666873365 is about 25823.8913605212. The cubic root of 666873365 is about 873.6707392202.

The spelling of 666873365 in words is "six hundred sixty-six million, eight hundred seventy-three thousand, three hundred sixty-five".