1720651260101 has 2 divisors, whose sum is σ = 1720651260102. Its totient is φ = 1720651260100.

The previous prime is 1720651260049. The next prime is 1720651260109. The reversal of 1720651260101 is 1010621560271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1239013872100 + 481637388001 = 1113110^2 + 694001^2 .

It is an emirp because it is prime and its reverse (1010621560271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1720651260101 - 2³⁴ = 1703471390917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720651260109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860325630050 + 860325630051.

It is an arithmetic number, because the mean of its divisors is an integer number (860325630051).

Almost surely, 2^{1720651260101} is an apocalyptic number.

It is an amenable number.

1720651260101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720651260101 is an equidigital number, since it uses as much as digits as its factorization.

1720651260101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 1720651260101 in words is "one trillion, seven hundred twenty billion, six hundred fifty-one million, two hundred sixty thousand, one hundred one".