321761662656 has 168 divisors, whose sum is σ = 990661782960. Its totient is φ = 91900182528.

The previous prime is 321761662643. The next prime is 321761662667. The reversal of 321761662656 is 656266167123.

It is a tau number, because it is divible by the number of its divisors (168).

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 321761662599 and 321761662608.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48099760 + ... + 48106448.

Almost surely, 2^321761662656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321761662656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (495330891480).

321761662656 is an abundant number, since it is smaller than the sum of its proper divisors (668900120304).

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

321761662656 is a wasteful number, since it uses less digits than its factorization.

321761662656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11831 (or 11814 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 51.

The spelling of 321761662656 in words is "three hundred twenty-one billion, seven hundred sixty-one million, six hundred sixty-two thousand, six hundred fifty-six".