1720231522745 has 16 divisors (see below), whose sum is σ = 2087287012800. Its totient is φ = 1360927139904.

The previous prime is 1720231522729. The next prime is 1720231522753. The reversal of 1720231522745 is 5472251320271.

It is a cyclic number.

It is not a de Polignac number, because 1720231522745 - 2⁴ = 1720231522729 is a prime.

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, 4916867 + ... + 5255096.

It is an arithmetic number, because the mean of its divisors is an integer number (130455438300).

Almost surely, 2^{1720231522745} is an apocalyptic number.

It is an amenable number.

1720231522745 is a deficient number, since it is larger than the sum of its proper divisors (367055490055).

1720231522745 is a wasteful number, since it uses less digits than its factorization.

1720231522745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10172344.

The product of its (nonzero) digits is 235200, while the sum is 41.

The spelling of 1720231522745 in words is "one trillion, seven hundred twenty billion, two hundred thirty-one million, five hundred twenty-two thousand, seven hundred forty-five".