666124555 has 4 divisors (see below), whose sum is σ = 799349472. Its totient is φ = 532899640.

The previous prime is 666124531. The next prime is 666124601. The reversal of 666124555 is 555421666.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 666124555 - 2⁷ = 666124427 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 66612451 + ... + 66612460.

It is an arithmetic number, because the mean of its divisors is an integer number (199837368).

Almost surely, 2^666124555 is an apocalyptic number.

666124555 is a deficient number, since it is larger than the sum of its proper divisors (133224917).

666124555 is a wasteful number, since it uses less digits than its factorization.

666124555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133224916.

The product of its digits is 216000, while the sum is 40.

The square root of 666124555 is about 25809.3888924167. The cubic root of 666124555 is about 873.3436114434.

The spelling of 666124555 in words is "six hundred sixty-six million, one hundred twenty-four thousand, five hundred fifty-five".