320218401656 has 32 divisors (see below), whose sum is σ = 643387101840. Its totient is φ = 148875452928.

The previous prime is 320218401647. The next prime is 320218401677. The reversal of 320218401656 is 656104812023.

It is a congruent number.

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, 14172731 + ... + 14195306.

Almost surely, 2^320218401656 is an apocalyptic number.

It is an amenable number.

320218401656 is an abundant number, since it is smaller than the sum of its proper divisors (323168700184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320218401656 is a wasteful number, since it uses less digits than its factorization.

320218401656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28368143 (or 28368139 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 320218401656 in words is "three hundred twenty billion, two hundred eighteen million, four hundred one thousand, six hundred fifty-six".