6644577785473 has 2 divisors, whose sum is σ = 6644577785474. Its totient is φ = 6644577785472.

The previous prime is 6644577785387. The next prime is 6644577785533. The reversal of 6644577785473 is 3745877754466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6282356770369 + 362221015104 = 2506463^2 + 601848^2 .

It is a cyclic number.

It is not a de Polignac number, because 6644577785473 - 2²⁵ = 6644544231041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6644577785396 and 6644577785405.

It is not a weakly prime, because it can be changed into another prime (6644557785473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322288892736 + 3322288892737.

It is an arithmetic number, because the mean of its divisors is an integer number (3322288892737).

Almost surely, 2^{6644577785473} is an apocalyptic number.

It is an amenable number.

6644577785473 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644577785473 is an equidigital number, since it uses as much as digits as its factorization.

6644577785473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3319142400, while the sum is 73.

The spelling of 6644577785473 in words is "six trillion, six hundred forty-four billion, five hundred seventy-seven million, seven hundred eighty-five thousand, four hundred seventy-three".