1720217130065 has 32 divisors (see below), whose sum is σ = 2499031595520. Its totient is φ = 1109700393984.

The previous prime is 1720217130017. The next prime is 1720217130101. The reversal of 1720217130065 is 5600317120271.

It is not a de Polignac number, because 1720217130065 - 2¹² = 1720217125969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 712964 + ... + 1987146.

It is an arithmetic number, because the mean of its divisors is an integer number (78094737360).

Almost surely, 2^{1720217130065} is an apocalyptic number.

It is an amenable number.

1720217130065 is a deficient number, since it is larger than the sum of its proper divisors (778814465455).

1720217130065 is a wasteful number, since it uses less digits than its factorization.

1720217130065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276481.

The product of its (nonzero) digits is 17640, while the sum is 35.

The spelling of 1720217130065 in words is "one trillion, seven hundred twenty billion, two hundred seventeen million, one hundred thirty thousand, sixty-five".