1720276197649 has 9 divisors (see below), whose sum is σ = 1739940388977. Its totient is φ = 1700831831424.

The previous prime is 1720276197637. The next prime is 1720276197683. The reversal of 1720276197649 is 9467916720271.

The square root of 1720276197649 is 1311593.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 5307851025 + 1714968346624 = 72855^2 + 1309568^2 .

It is not a de Polignac number, because 1720276197649 - 2⁹ = 1720276197137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720276191649) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 116724409 + ... + 116739145.

Almost surely, 2^{1720276197649} is an apocalyptic number.

1720276197649 is the 1311593-rd square number.

1720276197649 is the 655797-th centered octagonal number.

It is an amenable number.

1720276197649 is a deficient number, since it is larger than the sum of its proper divisors (19664191328).

1720276197649 is an frugal number, since it uses more digits than its factorization.

1720276197649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29652 (or 14826 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 61.

The spelling of 1720276197649 in words is "one trillion, seven hundred twenty billion, two hundred seventy-six million, one hundred ninety-seven thousand, six hundred forty-nine".