665503214536 has 8 divisors (see below), whose sum is σ = 1247818527270. Its totient is φ = 332751607264.

The previous prime is 665503214513. The next prime is 665503214539. The reversal of 665503214536 is 635412305566.

665503214536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 459269157636 + 206234056900 = 677694^2 + 454130^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (665503214539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41593950901 + ... + 41593950916.

Almost surely, 2^665503214536 is an apocalyptic number.

It is an amenable number.

665503214536 is a deficient number, since it is larger than the sum of its proper divisors (582315312734).

665503214536 is a wasteful number, since it uses less digits than its factorization.

665503214536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83187901823 (or 83187901819 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 46.

The spelling of 665503214536 in words is "six hundred sixty-five billion, five hundred three million, two hundred fourteen thousand, five hundred thirty-six".