665602208878 has 4 divisors (see below), whose sum is σ = 998403313320. Its totient is φ = 332801104438.

The previous prime is 665602208863. The next prime is 665602208911. The reversal of 665602208878 is 878802206566.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166400552218 + ... + 166400552221.

It is an arithmetic number, because the mean of its divisors is an integer number (249600828330).

Almost surely, 2^665602208878 is an apocalyptic number.

665602208878 is a deficient number, since it is larger than the sum of its proper divisors (332801104442).

665602208878 is a wasteful number, since it uses less digits than its factorization.

665602208878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332801104441.

The product of its (nonzero) digits is 15482880, while the sum is 58.

The spelling of 665602208878 in words is "six hundred sixty-five billion, six hundred two million, two hundred eight thousand, eight hundred seventy-eight".