6610421961 has 64 divisors (see below), whose sum is σ = 11816528640. Its totient is φ = 3598110720.

The previous prime is 6610421947. The next prime is 6610422011. The reversal of 6610421961 is 1691240166.

It is not a de Polignac number, because 6610421961 - 2⁷ = 6610421833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6610421911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 119721 + ... + 165993.

It is an arithmetic number, because the mean of its divisors is an integer number (184633260).

Almost surely, 2^6610421961 is an apocalyptic number.

It is an amenable number.

6610421961 is a deficient number, since it is larger than the sum of its proper divisors (5206106679).

6610421961 is a wasteful number, since it uses less digits than its factorization.

6610421961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46343 (or 46337 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 6610421961 is about 81304.5014805453. The cubic root of 6610421961 is about 1876.7642734735.

The spelling of 6610421961 in words is "six billion, six hundred ten million, four hundred twenty-one thousand, nine hundred sixty-one".