665447532478834 has 16 divisors (see below), whose sum is σ = 1141783019754048. Its totient is φ = 284937844329072.

The previous prime is 665447532478787. The next prime is 665447532478849. The reversal of 665447532478834 is 438874235744566.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21162925777 + ... + 21162957220.

It is an arithmetic number, because the mean of its divisors is an integer number (71361438734628).

Almost surely, 2^{665447532478834} is an apocalyptic number.

665447532478834 is a deficient number, since it is larger than the sum of its proper divisors (476335487275214).

665447532478834 is a wasteful number, since it uses less digits than its factorization.

665447532478834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42325884129.

The product of its digits is 13005619200, while the sum is 76.

The spelling of 665447532478834 in words is "six hundred sixty-five trillion, four hundred forty-seven billion, five hundred thirty-two million, four hundred seventy-eight thousand, eight hundred thirty-four".