1644612087373 has 2 divisors, whose sum is σ = 1644612087374. Its totient is φ = 1644612087372.

The previous prime is 1644612087343. The next prime is 1644612087401. The reversal of 1644612087373 is 3737802164461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 974273624809 + 670338462564 = 987053^2 + 818742^2 .

It is a cyclic number.

It is not a de Polignac number, because 1644612087373 - 2³⁷ = 1507173133901 is a prime.

It is a super-2 number, since 2×1644612087373² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1644612087373.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1644612087343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822306043686 + 822306043687.

It is an arithmetic number, because the mean of its divisors is an integer number (822306043687).

Almost surely, 2^{1644612087373} is an apocalyptic number.

It is an amenable number.

1644612087373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644612087373 is an equidigital number, since it uses as much as digits as its factorization.

1644612087373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 52.

The spelling of 1644612087373 in words is "one trillion, six hundred forty-four billion, six hundred twelve million, eighty-seven thousand, three hundred seventy-three".