6605421975 has 72 divisors (see below), whose sum is σ = 11959234560. Its totient is φ = 3484964160.

The previous prime is 6605421947. The next prime is 6605421997. The reversal of 6605421975 is 5791245066.

It is not a de Polignac number, because 6605421975 - 2¹⁰ = 6605420951 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6605421975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13789786 + ... + 13790264.

It is an arithmetic number, because the mean of its divisors is an integer number (166100480).

Almost surely, 2^6605421975 is an apocalyptic number.

6605421975 is a deficient number, since it is larger than the sum of its proper divisors (5353812585).

6605421975 is a wasteful number, since it uses less digits than its factorization.

6605421975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 1021 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 6605421975 is about 81273.7471450652. The cubic root of 6605421975 is about 1876.2909722710.

The spelling of 6605421975 in words is "six billion, six hundred five million, four hundred twenty-one thousand, nine hundred seventy-five".