1720661259337 has 2 divisors, whose sum is σ = 1720661259338. Its totient is φ = 1720661259336.

The previous prime is 1720661259319. The next prime is 1720661259389. The reversal of 1720661259337 is 7339521660271.

It is an a-pointer prime, because the next prime (1720661259389) can be obtained adding 1720661259337 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1608524012176 + 112137247161 = 1268276^2 + 334869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720661259337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1720661259397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860330629668 + 860330629669.

It is an arithmetic number, because the mean of its divisors is an integer number (860330629669).

Almost surely, 2^{1720661259337} is an apocalyptic number.

It is an amenable number.

1720661259337 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720661259337 is an equidigital number, since it uses as much as digits as its factorization.

1720661259337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2857680, while the sum is 52.

The spelling of 1720661259337 in words is "one trillion, seven hundred twenty billion, six hundred sixty-one million, two hundred fifty-nine thousand, three hundred thirty-seven".