1720623225329 has 2 divisors, whose sum is σ = 1720623225330. Its totient is φ = 1720623225328.

The previous prime is 1720623225193. The next prime is 1720623225331. The reversal of 1720623225329 is 9235223260271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1561600129600 + 159023095729 = 1249640^2 + 398777^2 .

It is an emirp because it is prime and its reverse (9235223260271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1720623225329 - 2²⁰ = 1720622176753 is a prime.

Together with 1720623225331, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1720623225329.

It is not a weakly prime, because it can be changed into another prime (1720623225389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860311612664 + 860311612665.

It is an arithmetic number, because the mean of its divisors is an integer number (860311612665).

Almost surely, 2^{1720623225329} is an apocalyptic number.

It is an amenable number.

1720623225329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720623225329 is an equidigital number, since it uses as much as digits as its factorization.

1720623225329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 1720623225329 in words is "one trillion, seven hundred twenty billion, six hundred twenty-three million, two hundred twenty-five thousand, three hundred twenty-nine".