123666659 has 2 divisors, whose sum is σ = 123666660. Its totient is φ = 123666658.

The previous prime is 123666637. The next prime is 123666677. The reversal of 123666659 is 956666321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123666659 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123666689) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61833329 + 61833330.

It is an arithmetic number, because the mean of its divisors is an integer number (61833330).

Almost surely, 2^123666659 is an apocalyptic number.

123666659 is a deficient number, since it is larger than the sum of its proper divisors (1).

123666659 is an equidigital number, since it uses as much as digits as its factorization.

123666659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 44.

The square root of 123666659 is about 11120.5512003677. The cubic root of 123666659 is about 498.2158532128.

The spelling of 123666659 in words is "one hundred twenty-three million, six hundred sixty-six thousand, six hundred fifty-nine".