665766456335122 has 4 divisors (see below), whose sum is σ = 998649684502686. Its totient is φ = 332883228167560.

The previous prime is 665766456335119. The next prime is 665766456335143. The reversal of 665766456335122 is 221533654667566.

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

It can be written as a sum of positive squares in only one way, i.e., 655611979416241 + 10154476918881 = 25604921^2 + 3186609^2 .

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166441614083779 + ... + 166441614083782.

Almost surely, 2^{665766456335122} is an apocalyptic number.

665766456335122 is a deficient number, since it is larger than the sum of its proper divisors (332883228167564).

665766456335122 is a wasteful number, since it uses less digits than its factorization.

665766456335122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332883228167563.

The product of its digits is 979776000, while the sum is 67.

The spelling of 665766456335122 in words is "six hundred sixty-five trillion, seven hundred sixty-six billion, four hundred fifty-six million, three hundred thirty-five thousand, one hundred twenty-two".