320935981889 has 4 divisors (see below), whose sum is σ = 334889720256. Its totient is φ = 306982243524.

The previous prime is 320935981841. The next prime is 320935981967. The reversal of 320935981889 is 988189539023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 988189539023 = 37 ⋅26707825379.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320935981889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (320935981589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6976869149 + ... + 6976869194.

It is an arithmetic number, because the mean of its divisors is an integer number (83722430064).

Almost surely, 2^320935981889 is an apocalyptic number.

It is an amenable number.

320935981889 is a deficient number, since it is larger than the sum of its proper divisors (13953738367).

320935981889 is a wasteful number, since it uses less digits than its factorization.

320935981889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13953738366.

The product of its (nonzero) digits is 33592320, while the sum is 65.

The spelling of 320935981889 in words is "three hundred twenty billion, nine hundred thirty-five million, nine hundred eighty-one thousand, eight hundred eighty-nine".