666733369 has 2 divisors, whose sum is σ = 666733370. Its totient is φ = 666733368.

The previous prime is 666733367. The next prime is 666733391. The reversal of 666733369 is 963337666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 623001600 + 43731769 = 24960^2 + 6613^2 .

It is a cyclic number.

It is not a de Polignac number, because 666733369 - 2¹ = 666733367 is a prime.

It is a super-2 number, since 2×666733369² = 889066770676180322, which contains 22 as substring.

Together with 666733367, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (666733367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333366684 + 333366685.

It is an arithmetic number, because the mean of its divisors is an integer number (333366685).

Almost surely, 2^666733369 is an apocalyptic number.

It is an amenable number.

666733369 is a deficient number, since it is larger than the sum of its proper divisors (1).

666733369 is an equidigital number, since it uses as much as digits as its factorization.

666733369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2204496, while the sum is 49.

The square root of 666733369 is about 25821.1806275391. The cubic root of 666733369 is about 873.6095986923.

The spelling of 666733369 in words is "six hundred sixty-six million, seven hundred thirty-three thousand, three hundred sixty-nine".