665363566 has 16 divisors (see below), whose sum is σ = 1140973920. Its totient is φ = 285068160.

The previous prime is 665363551. The next prime is 665363579.

665363566 is nontrivially palindromic in base 10.

665363566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×665363566³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63586 + ... + 73306.

It is an arithmetic number, because the mean of its divisors is an integer number (71310870).

Almost surely, 2^665363566 is an apocalyptic number.

665363566 is a deficient number, since it is larger than the sum of its proper divisors (475610354).

665363566 is a wasteful number, since it uses less digits than its factorization.

665363566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14619.

The product of its digits is 1749600, while the sum is 46.

The square root of 665363566 is about 25794.6421956188. The cubic root of 665363566 is about 873.0109118396.

It can be divided in two parts, 665 and 363566, that added together give a triangular number (364231 = T₈₅₃).

The spelling of 665363566 in words is "six hundred sixty-five million, three hundred sixty-three thousand, five hundred sixty-six".