666100489 has 2 divisors, whose sum is σ = 666100490. Its totient is φ = 666100488.

The previous prime is 666100483. The next prime is 666100543. The reversal of 666100489 is 984001666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 369985225 + 296115264 = 19235^2 + 17208^2 .

It is a cyclic number.

It is not a de Polignac number, because 666100489 - 2⁹ = 666099977 is a prime.

It is a super-2 number, since 2×666100489² = 887379722892078242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666100483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333050244 + 333050245.

It is an arithmetic number, because the mean of its divisors is an integer number (333050245).

Almost surely, 2^666100489 is an apocalyptic number.

It is an amenable number.

666100489 is a deficient number, since it is larger than the sum of its proper divisors (1).

666100489 is an equidigital number, since it uses as much as digits as its factorization.

666100489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 666100489 is about 25808.9226625212. The cubic root of 666100489 is about 873.3330938205. Note that the first 3 decimals are identical.

The spelling of 666100489 in words is "six hundred sixty-six million, one hundred thousand, four hundred eighty-nine".