1020172765723 has 2 divisors, whose sum is σ = 1020172765724. Its totient is φ = 1020172765722.

The previous prime is 1020172765687. The next prime is 1020172765741. The reversal of 1020172765723 is 3275672710201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020172765723 - 2¹⁷ = 1020172634651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020172765723.

It is not a weakly prime, because it can be changed into another prime (1020172763723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510086382861 + 510086382862.

It is an arithmetic number, because the mean of its divisors is an integer number (510086382862).

Almost surely, 2^{1020172765723} is an apocalyptic number.

1020172765723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020172765723 is an equidigital number, since it uses as much as digits as its factorization.

1020172765723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 43.

The spelling of 1020172765723 in words is "one trillion, twenty billion, one hundred seventy-two million, seven hundred sixty-five thousand, seven hundred twenty-three".