328727883661 has 4 divisors (see below), whose sum is σ = 348064818012. Its totient is φ = 309390949312.

The previous prime is 328727883623. The next prime is 328727883749. The reversal of 328727883661 is 166388727823.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 253819478025 + 74908405636 = 503805^2 + 273694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328727883661 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 328727883661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328727883961) 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, 9668467150 + ... + 9668467183.

It is an arithmetic number, because the mean of its divisors is an integer number (87016204503).

Almost surely, 2^328727883661 is an apocalyptic number.

It is an amenable number.

328727883661 is a deficient number, since it is larger than the sum of its proper divisors (19336934351).

328727883661 is a wasteful number, since it uses less digits than its factorization.

328727883661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19336934350.

The product of its digits is 32514048, while the sum is 61.

The spelling of 328727883661 in words is "three hundred twenty-eight billion, seven hundred twenty-seven million, eight hundred eighty-three thousand, six hundred sixty-one".