1720264821265 has 16 divisors (see below), whose sum is σ = 2078827214400. Its totient is φ = 1366544727360.

The previous prime is 1720264821239. The next prime is 1720264821283. The reversal of 1720264821265 is 5621284620271.

It is not a de Polignac number, because 1720264821265 - 2⁹ = 1720264820753 is a prime.

It is a super-3 number, since 3×1720264821265³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2012050 + ... + 2736580.

It is an arithmetic number, because the mean of its divisors is an integer number (129926700900).

Almost surely, 2^{1720264821265} is an apocalyptic number.

It is an amenable number.

1720264821265 is a deficient number, since it is larger than the sum of its proper divisors (358562393135).

1720264821265 is a wasteful number, since it uses less digits than its factorization.

1720264821265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727872.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 1720264821265 in words is "one trillion, seven hundred twenty billion, two hundred sixty-four million, eight hundred twenty-one thousand, two hundred sixty-five".