328981793549 has 4 divisors (see below), whose sum is σ = 328995052320. Its totient is φ = 328968534780.

The previous prime is 328981793509. The next prime is 328981793557. The reversal of 328981793549 is 945397189823.

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: 945397189823 = 263 ⋅3594666121.

It is a cyclic number.

It is not a de Polignac number, because 328981793549 - 2¹² = 328981789453 is a prime.

It is a super-3 number, since 3×328981793549³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328981793509) 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, 6592097 + ... + 6641814.

It is an arithmetic number, because the mean of its divisors is an integer number (82248763080).

Almost surely, 2^328981793549 is an apocalyptic number.

It is an amenable number.

328981793549 is a deficient number, since it is larger than the sum of its proper divisors (13258771).

328981793549 is a wasteful number, since it uses less digits than its factorization.

328981793549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13258770.

The product of its digits is 117573120, while the sum is 68.

The spelling of 328981793549 in words is "three hundred twenty-eight billion, nine hundred eighty-one million, seven hundred ninety-three thousand, five hundred forty-nine".