666430279 has 2 divisors, whose sum is σ = 666430280. Its totient is φ = 666430278.

The previous prime is 666430231. The next prime is 666430283. The reversal of 666430279 is 972034666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666430279 - 2¹³ = 666422087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666430679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333215139 + 333215140.

It is an arithmetic number, because the mean of its divisors is an integer number (333215140).

Almost surely, 2^666430279 is an apocalyptic number.

666430279 is a deficient number, since it is larger than the sum of its proper divisors (1).

666430279 is an equidigital number, since it uses as much as digits as its factorization.

666430279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 666430279 is about 25815.3109413774. The cubic root of 666430279 is about 873.4772007063.

The spelling of 666430279 in words is "six hundred sixty-six million, four hundred thirty thousand, two hundred seventy-nine".