1720617360247 has 2 divisors, whose sum is σ = 1720617360248. Its totient is φ = 1720617360246.

The previous prime is 1720617360193. The next prime is 1720617360251. The reversal of 1720617360247 is 7420637160271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720617360247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1720617360197 and 1720617360206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720617360647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860308680123 + 860308680124.

It is an arithmetic number, because the mean of its divisors is an integer number (860308680124).

Almost surely, 2^{1720617360247} is an apocalyptic number.

1720617360247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720617360247 is an equidigital number, since it uses as much as digits as its factorization.

1720617360247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 592704, while the sum is 46.

The spelling of 1720617360247 in words is "one trillion, seven hundred twenty billion, six hundred seventeen million, three hundred sixty thousand, two hundred forty-seven".