666037247 has 2 divisors, whose sum is σ = 666037248. Its totient is φ = 666037246.

The previous prime is 666037231. The next prime is 666037283. The reversal of 666037247 is 742730666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666037247 - 2⁴ = 666037231 is a prime.

It is a super-2 number, since 2×666037247² = 887211228782678018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666037217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333018623 + 333018624.

It is an arithmetic number, because the mean of its divisors is an integer number (333018624).

Almost surely, 2^666037247 is an apocalyptic number.

666037247 is a deficient number, since it is larger than the sum of its proper divisors (1).

666037247 is an equidigital number, since it uses as much as digits as its factorization.

666037247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 41.

The square root of 666037247 is about 25807.6974370051. The cubic root of 666037247 is about 873.3054538070.

The spelling of 666037247 in words is "six hundred sixty-six million, thirty-seven thousand, two hundred forty-seven".