666579750238 has 4 divisors (see below), whose sum is σ = 999869625360. Its totient is φ = 333289875118.

The previous prime is 666579750227. The next prime is 666579750247. The reversal of 666579750238 is 832057975666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 832057975666 = 2 ⋅416028987833.

It is a super-2 number, since 2×666579750238² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666579750238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166644937558 + ... + 166644937561.

It is an arithmetic number, because the mean of its divisors is an integer number (249967406340).

Almost surely, 2^666579750238 is an apocalyptic number.

666579750238 is a deficient number, since it is larger than the sum of its proper divisors (333289875122).

666579750238 is a wasteful number, since it uses less digits than its factorization.

666579750238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333289875121.

The product of its (nonzero) digits is 114307200, while the sum is 64.

The spelling of 666579750238 in words is "six hundred sixty-six billion, five hundred seventy-nine million, seven hundred fifty thousand, two hundred thirty-eight".