1644102155473 has 2 divisors, whose sum is σ = 1644102155474. Its totient is φ = 1644102155472.

The previous prime is 1644102155383. The next prime is 1644102155489. The reversal of 1644102155473 is 3745512014461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1532861895744 + 111240259729 = 1238088^2 + 333527^2 .

It is a cyclic number.

It is not a de Polignac number, because 1644102155473 - 2²⁹ = 1643565284561 is a prime.

It is a super-3 number, since 3×1644102155473³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1644102159473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822051077736 + 822051077737.

It is an arithmetic number, because the mean of its divisors is an integer number (822051077737).

Almost surely, 2^{1644102155473} is an apocalyptic number.

It is an amenable number.

1644102155473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644102155473 is an equidigital number, since it uses as much as digits as its factorization.

1644102155473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 1644102155473 in words is "one trillion, six hundred forty-four billion, one hundred two million, one hundred fifty-five thousand, four hundred seventy-three".