6646891460 has 24 divisors (see below), whose sum is σ = 15227424576. Its totient is φ = 2417051360.

The previous prime is 6646891393. The next prime is 6646891469. The reversal of 6646891460 is 641986466.

It is a junction number, because it is equal to n+sod(n) for n = 6646891399 and 6646891408.

It is not an unprimeable number, because it can be changed into a prime (6646891469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15106352 + ... + 15106791.

It is an arithmetic number, because the mean of its divisors is an integer number (634476024).

Almost surely, 2^6646891460 is an apocalyptic number.

It is an amenable number.

6646891460 is an abundant number, since it is smaller than the sum of its proper divisors (8580533116).

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

6646891460 is a wasteful number, since it uses less digits than its factorization.

6646891460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30213163 (or 30213161 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 50.

The square root of 6646891460 is about 81528.4702419958. The cubic root of 6646891460 is about 1880.2092965266.

The spelling of 6646891460 in words is "six billion, six hundred forty-six million, eight hundred ninety-one thousand, four hundred sixty".