666123224545 has 8 divisors (see below), whose sum is σ = 799372605096. Its totient is φ = 532882089216.

The previous prime is 666123224509. The next prime is 666123224561. The reversal of 666123224545 is 545422321666.

It can be written as a sum of positive squares in 4 ways, for example, as 5347704384 + 660775520161 = 73128^2 + 812881^2 .

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 666123224545 - 2²⁷ = 665989006817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666123224495 and 666123224504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1882152 + ... + 2207881.

It is an arithmetic number, because the mean of its divisors is an integer number (99921575637).

Almost surely, 2^666123224545 is an apocalyptic number.

It is an amenable number.

666123224545 is a deficient number, since it is larger than the sum of its proper divisors (133249380551).

666123224545 is a wasteful number, since it uses less digits than its factorization.

666123224545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4122611.

The product of its digits is 2073600, while the sum is 46.

The spelling of 666123224545 in words is "six hundred sixty-six billion, one hundred twenty-three million, two hundred twenty-four thousand, five hundred forty-five".