6641326121 has 4 divisors (see below), whose sum is σ = 6689803092. Its totient is φ = 6592849152.

The previous prime is 6641326093. The next prime is 6641326129. The reversal of 6641326121 is 1216231466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2826410896 + 3814915225 = 53164^2 + 61765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6641326121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6641326129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24238280 + ... + 24238553.

It is an arithmetic number, because the mean of its divisors is an integer number (1672450773).

Almost surely, 2^6641326121 is an apocalyptic number.

It is an amenable number.

6641326121 is a deficient number, since it is larger than the sum of its proper divisors (48476971).

6641326121 is a wasteful number, since it uses less digits than its factorization.

6641326121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48476970.

The product of its digits is 10368, while the sum is 32.

The square root of 6641326121 is about 81494.3318335699. The cubic root of 6641326121 is about 1879.6843933194.

Adding to 6641326121 its reverse (1216231466), we get a palindrome (7857557587).

The spelling of 6641326121 in words is "six billion, six hundred forty-one million, three hundred twenty-six thousand, one hundred twenty-one".