123666677 has 2 divisors, whose sum is σ = 123666678. Its totient is φ = 123666676.

The previous prime is 123666659. The next prime is 123666689. The reversal of 123666677 is 776666321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108347281 + 15319396 = 10409^2 + 3914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123666677 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123666637) 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, 61833338 + 61833339.

It is an arithmetic number, because the mean of its divisors is an integer number (61833339).

Almost surely, 2^123666677 is an apocalyptic number.

It is an amenable number.

123666677 is a deficient number, since it is larger than the sum of its proper divisors (1).

123666677 is an equidigital number, since it uses as much as digits as its factorization.

123666677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 44.

The square root of 123666677 is about 11120.5520096801. The cubic root of 123666677 is about 498.2158773850.

The spelling of 123666677 in words is "one hundred twenty-three million, six hundred sixty-six thousand, six hundred seventy-seven".