320691159616 has 63 divisors (see below), whose sum is σ = 646108790457. Its totient is φ = 157928628480.

The previous prime is 320691159611. The next prime is 320691159617. The reversal of 320691159616 is 616951196023.

The square root of 320691159616 is 566296.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 276045160000 + 44645999616 = 525400^2 + 211296^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320691159616.

It is not an unprimeable number, because it can be changed into a prime (320691159611) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 321655630 + ... + 321656626.

Almost surely, 2^320691159616 is an apocalyptic number.

320691159616 is the 566296-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320691159616

320691159616 is an abundant number, since it is smaller than the sum of its proper divisors (325417630841).

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

320691159616 is an frugal number, since it uses more digits than its factorization.

320691159616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 49.

Multiplying 320691159616 by its sum of digits (49), we get a square (15713866821184 = 3964072²).

The spelling of 320691159616 in words is "three hundred twenty billion, six hundred ninety-one million, one hundred fifty-nine thousand, six hundred sixteen".