3205555434640 has 160 divisors (see below), whose sum is σ = 8227269421056. Its totient is φ = 1154127605760.

The previous prime is 3205555434619. The next prime is 3205555434643. The reversal of 3205555434640 is 464345555023.

It is not an unprimeable number, because it can be changed into a prime (3205555434643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13125484 + ... + 13367476.

Almost surely, 2^{3205555434640} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3205555434640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4113634710528).

3205555434640 is an abundant number, since it is smaller than the sum of its proper divisors (5021713986416).

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

3205555434640 is a wasteful number, since it uses less digits than its factorization.

3205555434640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242337 (or 242331 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 46.

The spelling of 3205555434640 in words is "three trillion, two hundred five billion, five hundred fifty-five million, four hundred thirty-four thousand, six hundred forty".