666675124121 has 8 divisors (see below), whose sum is σ = 683585333088. Its totient is φ = 649795860000.

The previous prime is 666675124043. The next prime is 666675124127. The reversal of 666675124121 is 121421576666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666675124121 is a prime.

It is a super-2 number, since 2×666675124121² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666675124127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7692575 + ... + 7778756.

It is an arithmetic number, because the mean of its divisors is an integer number (85448166636).

Almost surely, 2^666675124121 is an apocalyptic number.

It is an amenable number.

666675124121 is a deficient number, since it is larger than the sum of its proper divisors (16910208967).

666675124121 is a wasteful number, since it uses less digits than its factorization.

666675124121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15472423.

The product of its digits is 725760, while the sum is 47.

The spelling of 666675124121 in words is "six hundred sixty-six billion, six hundred seventy-five million, one hundred twenty-four thousand, one hundred twenty-one".