6640321650 has 48 divisors (see below), whose sum is σ = 16473585504. Its totient is φ = 1770151680.

The previous prime is 6640321631. The next prime is 6640321663. The reversal of 6640321650 is 561230466.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 598554 + ... + 609546.

It is an arithmetic number, because the mean of its divisors is an integer number (343199698).

Almost surely, 2^6640321650 is an apocalyptic number.

6640321650 is an abundant number, since it is smaller than the sum of its proper divisors (9833263854).

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

6640321650 is a wasteful number, since it uses less digits than its factorization.

6640321650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15035 (or 15030 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 6640321650 is about 81488.1687731415. The cubic root of 6640321650 is about 1879.5896239102.

The spelling of 6640321650 in words is "six billion, six hundred forty million, three hundred twenty-one thousand, six hundred fifty".