1720665613344 has 96 divisors (see below), whose sum is σ = 4628452885056. Its totient is φ = 559379681280.

The previous prime is 1720665613333. The next prime is 1720665613363. The reversal of 1720665613344 is 4433165660271.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 1720665613293 and 1720665613302.

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, 12000444 + ... + 12142980.

It is an arithmetic number, because the mean of its divisors is an integer number (48213050886).

Almost surely, 2^{1720665613344} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1720665613344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2314226442528).

1720665613344 is an abundant number, since it is smaller than the sum of its proper divisors (2907787271712).

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

1720665613344 is a wasteful number, since it uses less digits than its factorization.

1720665613344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145658 (or 145650 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 48.

The spelling of 1720665613344 in words is "one trillion, seven hundred twenty billion, six hundred sixty-five million, six hundred thirteen thousand, three hundred forty-four".