665638588616 has 32 divisors (see below), whose sum is σ = 1290105223680. Its totient is φ = 321640070400.

The previous prime is 665638588597. The next prime is 665638588631. The reversal of 665638588616 is 616885836566.

665638588616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 1665665 + ... + 2026256.

It is an arithmetic number, because the mean of its divisors is an integer number (40315788240).

Almost surely, 2^665638588616 is an apocalyptic number.

It is an amenable number.

665638588616 is a deficient number, since it is larger than the sum of its proper divisors (624466635064).

665638588616 is a wasteful number, since it uses less digits than its factorization.

665638588616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3692685 (or 3692681 counting only the distinct ones).

The product of its digits is 298598400, while the sum is 68.

The spelling of 665638588616 in words is "six hundred sixty-five billion, six hundred thirty-eight million, five hundred eighty-eight thousand, six hundred sixteen".