666908145238 has 16 divisors (see below), whose sum is σ = 1015323471360. Its totient is φ = 328467287016.

The previous prime is 666908145229. The next prime is 666908145269. The reversal of 666908145238 is 832541809666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6671695 + ... + 6770917.

It is an arithmetic number, because the mean of its divisors is an integer number (63457716960).

Almost surely, 2^666908145238 is an apocalyptic number.

666908145238 is a deficient number, since it is larger than the sum of its proper divisors (348415326122).

666908145238 is a wasteful number, since it uses less digits than its factorization.

666908145238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149451.

The product of its (nonzero) digits is 14929920, while the sum is 58.

The spelling of 666908145238 in words is "six hundred sixty-six billion, nine hundred eight million, one hundred forty-five thousand, two hundred thirty-eight".