2101603664 has 20 divisors (see below), whose sum is σ = 4082126004. Its totient is φ = 1048151808.

The previous prime is 2101603619. The next prime is 2101603687. The reversal of 2101603664 is 4663061012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 717168400 + 1384435264 = 26780^2 + 37208^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159077 + ... + 171780.

Almost surely, 2^2101603664 is an apocalyptic number.

It is an amenable number.

2101603664 is a deficient number, since it is larger than the sum of its proper divisors (1980522340).

2101603664 is a wasteful number, since it uses less digits than its factorization.

2101603664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331262 (or 331256 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 2101603664 is about 45843.2510190977. The cubic root of 2101603664 is about 1280.9050532699.

Adding to 2101603664 its reverse (4663061012), we get a palindrome (6764664676).

The spelling of 2101603664 in words is "two billion, one hundred one million, six hundred three thousand, six hundred sixty-four".