6446404039363 has 4 divisors (see below), whose sum is σ = 6620631175600. Its totient is φ = 6272176903128.

The previous prime is 6446404039351. The next prime is 6446404039393. The reversal of 6446404039363 is 3639304046446.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6446404039363 - 2¹⁷ = 6446403908291 is a prime.

It is a super-2 number, since 2×6446404039363² (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 6446404039363.

It is not an unprimeable number, because it can be changed into a prime (6446404039393) 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, 87113568063 + ... + 87113568136.

It is an arithmetic number, because the mean of its divisors is an integer number (1655157793900).

Almost surely, 2^{6446404039363} is an apocalyptic number.

6446404039363 is a deficient number, since it is larger than the sum of its proper divisors (174227136237).

6446404039363 is a wasteful number, since it uses less digits than its factorization.

6446404039363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174227136236.

The product of its (nonzero) digits is 13436928, while the sum is 52.

The spelling of 6446404039363 in words is "six trillion, four hundred forty-six billion, four hundred four million, thirty-nine thousand, three hundred sixty-three".