1783365721373 has 2 divisors, whose sum is σ = 1783365721374. Its totient is φ = 1783365721372.

The previous prime is 1783365721301. The next prime is 1783365721399. The reversal of 1783365721373 is 3731275633871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 895449623524 + 887916097849 = 946282^2 + 942293^2 .

It is an emirp because it is prime and its reverse (3731275633871) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1783365721373 - 2²⁸ = 1783097285917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1783365721073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 891682860686 + 891682860687.

It is an arithmetic number, because the mean of its divisors is an integer number (891682860687).

Almost surely, 2^{1783365721373} is an apocalyptic number.

It is an amenable number.

1783365721373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1783365721373 is an equidigital number, since it uses as much as digits as its factorization.

1783365721373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13335840, while the sum is 56.

The spelling of 1783365721373 in words is "one trillion, seven hundred eighty-three billion, three hundred sixty-five million, seven hundred twenty-one thousand, three hundred seventy-three".