1644604064461 has 2 divisors, whose sum is σ = 1644604064462. Its totient is φ = 1644604064460.

The previous prime is 1644604064437. The next prime is 1644604064471.

It is a happy number.

1644604064461 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1637872682436 + 6731382025 = 1279794^2 + 82045^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1644604064461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1644604064471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822302032230 + 822302032231.

It is an arithmetic number, because the mean of its divisors is an integer number (822302032231).

Almost surely, 2^{1644604064461} is an apocalyptic number.

It is an amenable number.

1644604064461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644604064461 is an equidigital number, since it uses as much as digits as its factorization.

1644604064461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1327104, while the sum is 46.

The spelling of 1644604064461 in words is "one trillion, six hundred forty-four billion, six hundred four million, sixty-four thousand, four hundred sixty-one".