320998165489 has 3 divisors (see below), whose sum is σ = 320998732057. Its totient is φ = 320997598922.

The previous prime is 320998165451. The next prime is 320998165577. The reversal of 320998165489 is 984561899023.

The square root of 320998165489 is 566567.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 320998165489 - 2⁷ = 320998165361 is a prime.

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 320998165489.

It is not an unprimeable number, because it can be changed into a prime (320992165489) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 283284 + ... + 849850.

Almost surely, 2^320998165489 is an apocalyptic number.

320998165489 is the 566567-th square number.

320998165489 is the 283284-th centered octagonal number.

It is an amenable number.

320998165489 is a deficient number, since it is larger than the sum of its proper divisors (566568).

320998165489 is an frugal number, since it uses more digits than its factorization.

320998165489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133134 (or 566567 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 64.

Multiplying 320998165489 by its sum of digits (64), we get a square (20543882591296 = 4532536²).

The spelling of 320998165489 in words is "three hundred twenty billion, nine hundred ninety-eight million, one hundred sixty-five thousand, four hundred eighty-nine".