123666061 has 2 divisors, whose sum is σ = 123666062. Its totient is φ = 123666060.

The previous prime is 123666031. The next prime is 123666097. The reversal of 123666061 is 160666321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116510436 + 7155625 = 10794^2 + 2675^2 .

It is a cyclic number.

It is not a de Polignac number, because 123666061 - 2²⁵ = 90111629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123666031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61833030 + 61833031.

It is an arithmetic number, because the mean of its divisors is an integer number (61833031).

Almost surely, 2^123666061 is an apocalyptic number.

It is an amenable number.

123666061 is a deficient number, since it is larger than the sum of its proper divisors (1).

123666061 is an equidigital number, since it uses as much as digits as its factorization.

123666061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 123666061 is about 11120.5243131788. The cubic root of 123666061 is about 498.2150501574.

The spelling of 123666061 in words is "one hundred twenty-three million, six hundred sixty-six thousand, sixty-one".