1644273573457 has 2 divisors, whose sum is σ = 1644273573458. Its totient is φ = 1644273573456.

The previous prime is 1644273573427. The next prime is 1644273573557. The reversal of 1644273573457 is 7543753724461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 977322051216 + 666951522241 = 988596^2 + 816671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1644273573457 is a prime.

It is a super-3 number, since 3×1644273573457³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1644273573407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822136786728 + 822136786729.

It is an arithmetic number, because the mean of its divisors is an integer number (822136786729).

Almost surely, 2^{1644273573457} is an apocalyptic number.

It is an amenable number.

1644273573457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644273573457 is an equidigital number, since it uses as much as digits as its factorization.

1644273573457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59270400, while the sum is 58.

The spelling of 1644273573457 in words is "one trillion, six hundred forty-four billion, two hundred seventy-three million, five hundred seventy-three thousand, four hundred fifty-seven".