1728561307703 has 2 divisors, whose sum is σ = 1728561307704. Its totient is φ = 1728561307702.

The previous prime is 1728561307621. The next prime is 1728561307709. The reversal of 1728561307703 is 3077031658271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1728561307703 - 2²⁶ = 1728494198839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1728561307709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864280653851 + 864280653852.

It is an arithmetic number, because the mean of its divisors is an integer number (864280653852).

Almost surely, 2^{1728561307703} is an apocalyptic number.

1728561307703 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728561307703 is an equidigital number, since it uses as much as digits as its factorization.

1728561307703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1481760, while the sum is 50.

The spelling of 1728561307703 in words is "one trillion, seven hundred twenty-eight billion, five hundred sixty-one million, three hundred seven thousand, seven hundred three".