1720217130066 has 32 divisors (see below), whose sum is σ = 3822918765120. Its totient is φ = 573373605312.

The previous prime is 1720217130017. The next prime is 1720217130101. The reversal of 1720217130066 is 6600317120271.

It is a happy number.

It is a super-2 number, since 2×1720217130066² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1720217130066.

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 15 ways as a sum of consecutive naturals, for example, 91546 + ... + 1857098.

It is an arithmetic number, because the mean of its divisors is an integer number (119466211410).

Almost surely, 2^{1720217130066} is an apocalyptic number.

1720217130066 is an abundant number, since it is smaller than the sum of its proper divisors (2102701635054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1720217130066 is a wasteful number, since it uses less digits than its factorization.

1720217130066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783607 (or 1783601 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The spelling of 1720217130066 in words is "one trillion, seven hundred twenty billion, two hundred seventeen million, one hundred thirty thousand, sixty-six".