6464440194349 has 2 divisors, whose sum is σ = 6464440194350. Its totient is φ = 6464440194348.

The previous prime is 6464440194323. The next prime is 6464440194361. The reversal of 6464440194349 is 9434910444646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3557561822500 + 2906878371849 = 1886150^2 + 1704957^2 .

It is a cyclic number.

It is not a de Polignac number, because 6464440194349 - 2¹⁵ = 6464440161581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6464440194293 and 6464440194302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6464470194349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3232220097174 + 3232220097175.

It is an arithmetic number, because the mean of its divisors is an integer number (3232220097175).

Almost surely, 2^{6464440194349} is an apocalyptic number.

It is an amenable number.

6464440194349 is a deficient number, since it is larger than the sum of its proper divisors (1).

6464440194349 is an equidigital number, since it uses as much as digits as its factorization.

6464440194349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35831808, while the sum is 58.

The spelling of 6464440194349 in words is "six trillion, four hundred sixty-four billion, four hundred forty million, one hundred ninety-four thousand, three hundred forty-nine".