1720506622117 has 4 divisors (see below), whose sum is σ = 1721939185036. Its totient is φ = 1719074059200.

The previous prime is 1720506622097. The next prime is 1720506622187. The reversal of 1720506622117 is 7112266050271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 735968388996 + 984538233121 = 857886^2 + 992239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720506622117 - 2⁷ = 1720506621989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1720506622117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720506622187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 716279658 + ... + 716282059.

It is an arithmetic number, because the mean of its divisors is an integer number (430484796259).

Almost surely, 2^{1720506622117} is an apocalyptic number.

It is an amenable number.

1720506622117 is a deficient number, since it is larger than the sum of its proper divisors (1432562919).

1720506622117 is a wasteful number, since it uses less digits than its factorization.

1720506622117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432562918.

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 1720506622117 in words is "one trillion, seven hundred twenty billion, five hundred six million, six hundred twenty-two thousand, one hundred seventeen".