6641188921 has 8 divisors (see below), whose sum is σ = 7006953600. Its totient is φ = 6277047120.

The previous prime is 6641188817. The next prime is 6641188933. The reversal of 6641188921 is 1298811466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6641188921 - 2¹⁷ = 6641057849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6641188121) 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, 397306 + ... + 413683.

It is an arithmetic number, because the mean of its divisors is an integer number (875869200).

Almost surely, 2^6641188921 is an apocalyptic number.

It is an amenable number.

6641188921 is a deficient number, since it is larger than the sum of its proper divisors (365764679).

6641188921 is a wasteful number, since it uses less digits than its factorization.

6641188921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811439.

The product of its digits is 165888, while the sum is 46.

The square root of 6641188921 is about 81493.4900528870. The cubic root of 6641188921 is about 1879.6714493948.

The spelling of 6641188921 in words is "six billion, six hundred forty-one million, one hundred eighty-eight thousand, nine hundred twenty-one".