6621975760 has 40 divisors (see below), whose sum is σ = 16206418080. Its totient is φ = 2509379712.

The previous prime is 6621975757. The next prime is 6621975761. The reversal of 6621975760 is 675791266.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621975761) 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, 2176762 + ... + 2179801.

It is an arithmetic number, because the mean of its divisors is an integer number (405160452).

Almost surely, 2^6621975760 is an apocalyptic number.

It is an amenable number.

6621975760 is an abundant number, since it is smaller than the sum of its proper divisors (9584442320).

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

6621975760 is a wasteful number, since it uses less digits than its factorization.

6621975760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4356595 (or 4356589 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 49.

The square root of 6621975760 is about 81375.5231012373. The cubic root of 6621975760 is about 1877.8570497237.

The spelling of 6621975760 in words is "six billion, six hundred twenty-one million, nine hundred seventy-five thousand, seven hundred sixty".