666727349 has 2 divisors, whose sum is σ = 666727350. Its totient is φ = 666727348.

The previous prime is 666727337. The next prime is 666727357. The reversal of 666727349 is 943727666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 481495249 + 185232100 = 21943^2 + 13610^2 .

It is a cyclic number.

It is not a de Polignac number, because 666727349 - 2⁸ = 666727093 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 666727297 and 666727306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666727319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333363674 + 333363675.

It is an arithmetic number, because the mean of its divisors is an integer number (333363675).

Almost surely, 2^666727349 is an apocalyptic number.

It is an amenable number.

666727349 is a deficient number, since it is larger than the sum of its proper divisors (1).

666727349 is an equidigital number, since it uses as much as digits as its factorization.

666727349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 50.

The square root of 666727349 is about 25821.0640563088. The cubic root of 666727349 is about 873.6069693826.

The spelling of 666727349 in words is "six hundred sixty-six million, seven hundred twenty-seven thousand, three hundred forty-nine".