1722265725121 has 4 divisors (see below), whose sum is σ = 1723074682500. Its totient is φ = 1721456767744.

The previous prime is 1722265725073. The next prime is 1722265725179. The reversal of 1722265725121 is 1215275622271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 388298474496 + 1333967250625 = 623136^2 + 1154975^2 .

It is a cyclic number.

It is not a de Polignac number, because 1722265725121 - 2²⁵ = 1722232170689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1722265725221) 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 3 ways as a sum of consecutive naturals, for example, 404475496 + ... + 404479753.

It is an arithmetic number, because the mean of its divisors is an integer number (430768670625).

Almost surely, 2^{1722265725121} is an apocalyptic number.

It is an amenable number.

1722265725121 is a deficient number, since it is larger than the sum of its proper divisors (808957379).

1722265725121 is an equidigital number, since it uses as much as digits as its factorization.

1722265725121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808957378.

The product of its digits is 235200, while the sum is 43.

The spelling of 1722265725121 in words is "one trillion, seven hundred twenty-two billion, two hundred sixty-five million, seven hundred twenty-five thousand, one hundred twenty-one".