1720328140625 has 14 divisors (see below), whose sum is σ = 2150382670062. Its totient is φ = 1376262500000.

The previous prime is 1720328140621. The next prime is 1720328140651. The reversal of 1720328140625 is 5260418230271.

It can be written as a sum of positive squares in 7 ways, for example, as 1668000663121 + 52327477504 = 1291511^2 + 228752^2 .

It is not a de Polignac number, because 1720328140625 - 2² = 1720328140621 is a prime.

It is a super-2 number, since 2×1720328140625² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720328140621) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 55034876 + ... + 55066125.

Almost surely, 2^{1720328140625} is an apocalyptic number.

It is an amenable number.

1720328140625 is a deficient number, since it is larger than the sum of its proper divisors (430054529437).

1720328140625 is an frugal number, since it uses more digits than its factorization.

1720328140625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110101031 (or 110101006 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 1720328140625 in words is "one trillion, seven hundred twenty billion, three hundred twenty-eight million, one hundred forty thousand, six hundred twenty-five".