123666601 has 8 divisors (see below), whose sum is σ = 124567560. Its totient is φ = 122769408.

The previous prime is 123666589. The next prime is 123666637. The reversal of 123666601 is 106666321.

It can be written as a sum of positive squares in 4 ways, for example, as 53509225 + 70157376 = 7315^2 + 8376^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123666601 - 2¹⁵ = 123633833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123666401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99355 + ... + 100591.

It is an arithmetic number, because the mean of its divisors is an integer number (15570945).

Almost surely, 2^123666601 is an apocalyptic number.

It is an amenable number.

123666601 is a deficient number, since it is larger than the sum of its proper divisors (900959).

123666601 is a wasteful number, since it uses less digits than its factorization.

123666601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883.

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

The square root of 123666601 is about 11120.5485925830. The cubic root of 123666601 is about 498.2157753246.

The spelling of 123666601 in words is "one hundred twenty-three million, six hundred sixty-six thousand, six hundred one".