1721305785485 has 64 divisors (see below), whose sum is σ = 2440096323840. Its totient is φ = 1149190778880.

The previous prime is 1721305785467. The next prime is 1721305785523. The reversal of 1721305785485 is 5845875031271.

It is not a de Polignac number, because 1721305785485 - 2⁸ = 1721305785229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1721305785485.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 98132846 + ... + 98150384.

It is an arithmetic number, because the mean of its divisors is an integer number (38126505060).

Almost surely, 2^{1721305785485} is an apocalyptic number.

It is an amenable number.

1721305785485 is a deficient number, since it is larger than the sum of its proper divisors (718790538355).

1721305785485 is a wasteful number, since it uses less digits than its factorization.

1721305785485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18318.

The product of its (nonzero) digits is 9408000, while the sum is 56.

The spelling of 1721305785485 in words is "one trillion, seven hundred twenty-one billion, three hundred five million, seven hundred eighty-five thousand, four hundred eighty-five".