320643661504 has 28 divisors (see below), whose sum is σ = 636596775064. Its totient is φ = 160241324544.

The previous prime is 320643661453. The next prime is 320643661531. The reversal of 320643661504 is 405166346023.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1129362 + ... + 1384465.

Almost surely, 2^320643661504 is an apocalyptic number.

It is an amenable number.

320643661504 is a deficient number, since it is larger than the sum of its proper divisors (315953113560).

320643661504 is a wasteful number, since it uses less digits than its factorization.

320643661504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515832 (or 2515822 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 320643661504 in words is "three hundred twenty billion, six hundred forty-three million, six hundred sixty-one thousand, five hundred four".