1720651260109 has 2 divisors, whose sum is σ = 1720651260110. Its totient is φ = 1720651260108.

The previous prime is 1720651260101. The next prime is 1720651260151. The reversal of 1720651260109 is 9010621560271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 935649944100 + 785001316009 = 967290^2 + 886003^2 .

It is an emirp because it is prime and its reverse (9010621560271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1720651260109 - 2³ = 1720651260101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720651260101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860325630054 + 860325630055.

It is an arithmetic number, because the mean of its divisors is an integer number (860325630055).

Almost surely, 2^{1720651260109} is an apocalyptic number.

It is an amenable number.

1720651260109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720651260109 is an equidigital number, since it uses as much as digits as its factorization.

1720651260109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 1720651260109 in words is "one trillion, seven hundred twenty billion, six hundred fifty-one million, two hundred sixty thousand, one hundred nine".