1720623225757 has 2 divisors, whose sum is σ = 1720623225758. Its totient is φ = 1720623225756.

The previous prime is 1720623225743. The next prime is 1720623225809. The reversal of 1720623225757 is 7575223260271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1670739790041 + 49883435716 = 1292571^2 + 223346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720623225757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1720623225757.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720624225757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860311612878 + 860311612879.

It is an arithmetic number, because the mean of its divisors is an integer number (860311612879).

Almost surely, 2^{1720623225757} is an apocalyptic number.

It is an amenable number.

1720623225757 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720623225757 is an equidigital number, since it uses as much as digits as its factorization.

1720623225757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2469600, while the sum is 49.

The spelling of 1720623225757 in words is "one trillion, seven hundred twenty billion, six hundred twenty-three million, two hundred twenty-five thousand, seven hundred fifty-seven".