1720947798801 has 189 divisors, whose sum is σ = 3304411958169. Its totient is φ = 892582059600.

The previous prime is 1720947798611. The next prime is 1720947798833. The reversal of 1720947798801 is 1088977490271.

The square root of 1720947798801 is 1311849.

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

1720947798801 is a `hidden beast` number, since 1 + 72 + 0 + 9 + 477 + 98 + 8 + 0 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (189).

It is a de Polignac number, because none of the positive numbers 2^k-1720947798801 is a prime.

It is a super-2 number, since 2×1720947798801² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1720947798301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 188 ways as a sum of consecutive naturals, for example, 2727333756 + ... + 2727334386.

Almost surely, 2^{1720947798801} is an apocalyptic number.

1720947798801 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1720947798801 is the 1311849-th square number.

1720947798801 is the 655925-th centered octagonal number.

It is an amenable number.

1720947798801 is a deficient number, since it is larger than the sum of its proper divisors (1583464159368).

1720947798801 is an frugal number, since it uses more digits than its factorization.

1720947798801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 63.

The spelling of 1720947798801 in words is "one trillion, seven hundred twenty billion, nine hundred forty-seven million, seven hundred ninety-eight thousand, eight hundred one".