665016767616415 has 16 divisors (see below), whose sum is σ = 819717977231712. Its totient is φ = 517552729144704.

The previous prime is 665016767616269. The next prime is 665016767616431. The reversal of 665016767616415 is 514616767610566.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 665016767616415 - 2¹⁵ = 665016767583647 is a prime.

It is a Duffinian number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 283356069 + ... + 285693358.

It is an arithmetic number, because the mean of its divisors is an integer number (51232373576982).

Almost surely, 2^{665016767616415} is an apocalyptic number.

665016767616415 is a deficient number, since it is larger than the sum of its proper divisors (154701209615297).

665016767616415 is a wasteful number, since it uses less digits than its factorization.

665016767616415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569055786.

The product of its (nonzero) digits is 228614400, while the sum is 67.

The spelling of 665016767616415 in words is "six hundred sixty-five trillion, sixteen billion, seven hundred sixty-seven million, six hundred sixteen thousand, four hundred fifteen".