665123175783330 has 64 divisors (see below), whose sum is σ = 1742837293421568. Its totient is φ = 161110140551360.

The previous prime is 665123175783251. The next prime is 665123175783331. The reversal of 665123175783330 is 33387571321566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (665123175783331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 823604904 + ... + 824412083.

It is an arithmetic number, because the mean of its divisors is an integer number (27231832709712).

Almost surely, 2^{665123175783330} is an apocalyptic number.

665123175783330 is an abundant number, since it is smaller than the sum of its proper divisors (1077714117638238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665123175783330 is a wasteful number, since it uses less digits than its factorization.

665123175783330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648018231.

The product of its (nonzero) digits is 57153600, while the sum is 60.

The spelling of 665123175783330 in words is "six hundred sixty-five trillion, one hundred twenty-three billion, one hundred seventy-five million, seven hundred eighty-three thousand, three hundred thirty".