666533279 has 2 divisors, whose sum is σ = 666533280. Its totient is φ = 666533278.

The previous prime is 666533251. The next prime is 666533293. The reversal of 666533279 is 972335666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666533279 - 2¹⁶ = 666467743 is a prime.

It is a super-2 number, since 2×666533279² = 888533224028983682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666533209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333266639 + 333266640.

It is an arithmetic number, because the mean of its divisors is an integer number (333266640).

Almost surely, 2^666533279 is an apocalyptic number.

666533279 is a deficient number, since it is larger than the sum of its proper divisors (1).

666533279 is an equidigital number, since it uses as much as digits as its factorization.

666533279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 47.

The square root of 666533279 is about 25817.3058044406. The cubic root of 666533279 is about 873.5221984202.

The spelling of 666533279 in words is "six hundred sixty-six million, five hundred thirty-three thousand, two hundred seventy-nine".