321720166712 has 24 divisors (see below), whose sum is σ = 701711078760. Its totient is φ = 137880071280.

The previous prime is 321720166709. The next prime is 321720166753. The reversal of 321720166712 is 217661027123.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 410356964 + ... + 410357747.

It is an arithmetic number, because the mean of its divisors is an integer number (29237961615).

Almost surely, 2^321720166712 is an apocalyptic number.

It is an amenable number.

321720166712 is an abundant number, since it is smaller than the sum of its proper divisors (379990912048).

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

321720166712 is a wasteful number, since it uses less digits than its factorization.

321720166712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820714731 (or 820714720 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 321720166712 in words is "three hundred twenty-one billion, seven hundred twenty million, one hundred sixty-six thousand, seven hundred twelve".