665016165505 has 8 divisors (see below), whose sum is σ = 798091443072. Its totient is φ = 531964902768.

The previous prime is 665016165481. The next prime is 665016165553. The reversal of 665016165505 is 505561610566.

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

It is a cyclic number.

It is not a de Polignac number, because 665016165505 - 2⁹ = 665016164993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5942727 + ... + 6053596.

It is an arithmetic number, because the mean of its divisors is an integer number (99761430384).

Almost surely, 2^665016165505 is an apocalyptic number.

It is an amenable number.

665016165505 is a deficient number, since it is larger than the sum of its proper divisors (133075277567).

665016165505 is a wasteful number, since it uses less digits than its factorization.

665016165505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12007415.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 665016165505 in words is "six hundred sixty-five billion, sixteen million, one hundred sixty-five thousand, five hundred five".