665016767616416 has 96 divisors (see below), whose sum is σ = 1363747382983440. Its totient is φ = 318981368217600.

The previous prime is 665016767616269. The next prime is 665016767616431. The reversal of 665016767616416 is 614616767610566.

It can be written as a sum of positive squares in 8 ways, for example, as 81172964236816 + 583843803379600 = 9009604^2 + 24162860^2 .

It is a super-3 number, since 3×665016767616416³ (a number of 45 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (68) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5402420 + ... + 36867596.

Almost surely, 2^{665016767616416} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665016767616416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (681873691491720).

665016767616416 is an abundant number, since it is smaller than the sum of its proper divisors (698730615367024).

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

665016767616416 is a wasteful number, since it uses less digits than its factorization.

665016767616416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31465498 (or 31465490 counting only the distinct ones).

The product of its (nonzero) digits is 274337280, while the sum is 68.

The spelling of 665016767616416 in words is "six hundred sixty-five trillion, sixteen billion, seven hundred sixty-seven million, six hundred sixteen thousand, four hundred sixteen".