666653333 has 2 divisors, whose sum is σ = 666653334. Its totient is φ = 666653332.

The previous prime is 666653329. The next prime is 666653341. The reversal of 666653333 is 333356666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 587674564 + 78978769 = 24242^2 + 8887^2 .

It is a cyclic number.

It is not a de Polignac number, because 666653333 - 2² = 666653329 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666653033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333326666 + 333326667.

It is an arithmetic number, because the mean of its divisors is an integer number (333326667).

Almost surely, 2^666653333 is an apocalyptic number.

It is an amenable number.

666653333 is a deficient number, since it is larger than the sum of its proper divisors (1).

666653333 is an equidigital number, since it uses as much as digits as its factorization.

666653333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 41.

The square root of 666653333 is about 25819.6307680803. The cubic root of 666653333 is about 873.5746406821.

The spelling of 666653333 in words is "six hundred sixty-six million, six hundred fifty-three thousand, three hundred thirty-three".