1601603556 has 96 divisors (see below), whose sum is σ = 4569707520. Its totient is φ = 426384000.

The previous prime is 1601603543. The next prime is 1601603603. The reversal of 1601603556 is 6553061061.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89131 + ... + 105581.

It is an arithmetic number, because the mean of its divisors is an integer number (47601120).

Almost surely, 2^1601603556 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 1601603556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2284853760).

1601603556 is an abundant number, since it is smaller than the sum of its proper divisors (2968103964).

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

1601603556 is a wasteful number, since it uses less digits than its factorization.

1601603556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16545 (or 16543 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 1601603556 is about 40020.0394302654. The cubic root of 1601603556 is about 1169.9977003388.

The spelling of 1601603556 in words is "one billion, six hundred one million, six hundred three thousand, five hundred fifty-six".