6464440194319 has 16 divisors (see below), whose sum is σ = 6689669382144. Its totient is φ = 6240273127200.

The previous prime is 6464440194301. The next prime is 6464440194323. The reversal of 6464440194319 is 9134910444646.

It is a cyclic number.

It is not a de Polignac number, because 6464440194319 - 2¹¹ = 6464440192271 is a prime.

It is a super-2 number, since 2×6464440194319² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6464440194319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6464440194349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20996082 + ... + 21301744.

It is an arithmetic number, because the mean of its divisors is an integer number (418104336384).

Almost surely, 2^{6464440194319} is an apocalyptic number.

6464440194319 is a deficient number, since it is larger than the sum of its proper divisors (225229187825).

6464440194319 is a wasteful number, since it uses less digits than its factorization.

6464440194319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307398.

The product of its (nonzero) digits is 8957952, while the sum is 55.

The spelling of 6464440194319 in words is "six trillion, four hundred sixty-four billion, four hundred forty million, one hundred ninety-four thousand, three hundred nineteen".