665172588818 has 8 divisors (see below), whose sum is σ = 1050272508720. Its totient is φ = 315081752580.

The previous prime is 665172588811. The next prime is 665172588851. The reversal of 665172588818 is 818885271566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (665172588811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8752270868 + ... + 8752270943.

It is an arithmetic number, because the mean of its divisors is an integer number (131284063590).

Almost surely, 2^665172588818 is an apocalyptic number.

665172588818 is a deficient number, since it is larger than the sum of its proper divisors (385099919902).

665172588818 is a wasteful number, since it uses less digits than its factorization.

665172588818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17504541832.

The product of its digits is 51609600, while the sum is 65.

The spelling of 665172588818 in words is "six hundred sixty-five billion, one hundred seventy-two million, five hundred eighty-eight thousand, eight hundred eighteen".