665020506602 has 4 divisors (see below), whose sum is σ = 997530759906. Its totient is φ = 332510253300.

The previous prime is 665020506599. The next prime is 665020506613. The reversal of 665020506602 is 206605020566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 376800773281 + 288219733321 = 613841^2 + 536861^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166255126649 + ... + 166255126652.

Almost surely, 2^665020506602 is an apocalyptic number.

665020506602 is a deficient number, since it is larger than the sum of its proper divisors (332510253304).

665020506602 is a wasteful number, since it uses less digits than its factorization.

665020506602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332510253303.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 665020506602 in words is "six hundred sixty-five billion, twenty million, five hundred six thousand, six hundred two".