6641225291 has 2 divisors, whose sum is σ = 6641225292. Its totient is φ = 6641225290.

The previous prime is 6641225231. The next prime is 6641225293. The reversal of 6641225291 is 1925221466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6641225291 - 2²² = 6637030987 is a prime.

Together with 6641225293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6641225293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320612645 + 3320612646.

It is an arithmetic number, because the mean of its divisors is an integer number (3320612646).

Almost surely, 2^6641225291 is an apocalyptic number.

6641225291 is a deficient number, since it is larger than the sum of its proper divisors (1).

6641225291 is an equidigital number, since it uses as much as digits as its factorization.

6641225291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 6641225291 is about 81493.7131992401. The cubic root of 6641225291 is about 1879.6748806843.

The spelling of 6641225291 in words is "six billion, six hundred forty-one million, two hundred twenty-five thousand, two hundred ninety-one".