1644460644461 has 2 divisors, whose sum is σ = 1644460644462. Its totient is φ = 1644460644460.

The previous prime is 1644460644457. The next prime is 1644460644469.

1644460644461 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 961441041961 + 683019602500 = 980531^2 + 826450^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1644460644461 - 2² = 1644460644457 is a prime.

It is a super-2 number, since 2×1644460644461² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1644460644469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822230322230 + 822230322231.

It is an arithmetic number, because the mean of its divisors is an integer number (822230322231).

Almost surely, 2^{1644460644461} is an apocalyptic number.

It is an amenable number.

1644460644461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644460644461 is an equidigital number, since it uses as much as digits as its factorization.

1644460644461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5308416, while the sum is 50.

The spelling of 1644460644461 in words is "one trillion, six hundred forty-four billion, four hundred sixty million, six hundred forty-four thousand, four hundred sixty-one".