64449794219 has 2 divisors, whose sum is σ = 64449794220. Its totient is φ = 64449794218.

The previous prime is 64449794207. The next prime is 64449794221. The reversal of 64449794219 is 91249794446.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64449794219 - 2⁴ = 64449794203 is a prime.

It is a super-2 number, since 2×64449794219² (a number of 22 digits) contains 22 as substring.

Together with 64449794221, 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 (64449194219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32224897109 + 32224897110.

It is an arithmetic number, because the mean of its divisors is an integer number (32224897110).

Almost surely, 2^64449794219 is an apocalyptic number.

64449794219 is a deficient number, since it is larger than the sum of its proper divisors (1).

64449794219 is an equidigital number, since it uses as much as digits as its factorization.

64449794219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 59.

The spelling of 64449794219 in words is "sixty-four billion, four hundred forty-nine million, seven hundred ninety-four thousand, two hundred nineteen".