123666511 has 2 divisors, whose sum is σ = 123666512. Its totient is φ = 123666510.

The previous prime is 123666481. The next prime is 123666539. The reversal of 123666511 is 115666321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123666511 - 2¹³ = 123658319 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123666911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61833255 + 61833256.

It is an arithmetic number, because the mean of its divisors is an integer number (61833256).

Almost surely, 2^123666511 is an apocalyptic number.

123666511 is a deficient number, since it is larger than the sum of its proper divisors (1).

123666511 is an equidigital number, since it uses as much as digits as its factorization.

123666511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 123666511 is about 11120.5445460193. The cubic root of 123666511 is about 498.2156544636.

The spelling of 123666511 in words is "one hundred twenty-three million, six hundred sixty-six thousand, five hundred eleven".