6601321900 has 18 divisors (see below), whose sum is σ = 14324868740. Its totient is φ = 2640528720.

The previous prime is 6601321897. The next prime is 6601321913. The reversal of 6601321900 is 91231066.

It is a super-2 number, since 2×6601321900² = 87154901654839220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33006510 + ... + 33006709.

Almost surely, 2^6601321900 is an apocalyptic number.

It is an amenable number.

6601321900 is an abundant number, since it is smaller than the sum of its proper divisors (7723546840).

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

6601321900 is a wasteful number, since it uses less digits than its factorization.

6601321900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66013233 (or 66013226 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 6601321900 is about 81248.5193711245. The cubic root of 6601321900 is about 1875.9026788362.

Adding to 6601321900 its reverse (91231066), we get a palindrome (6692552966).

The spelling of 6601321900 in words is "six billion, six hundred one million, three hundred twenty-one thousand, nine hundred".