1578020747789 has 2 divisors, whose sum is σ = 1578020747790. Its totient is φ = 1578020747788.

The previous prime is 1578020747783. The next prime is 1578020747801. The reversal of 1578020747789 is 9877470208751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 799876232164 + 778144515625 = 894358^2 + 882125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1578020747789 - 2¹⁶ = 1578020682253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1578020747783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 789010373894 + 789010373895.

It is an arithmetic number, because the mean of its divisors is an integer number (789010373895).

Almost surely, 2^{1578020747789} is an apocalyptic number.

It is an amenable number.

1578020747789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1578020747789 is an equidigital number, since it uses as much as digits as its factorization.

1578020747789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55319040, while the sum is 65.

The spelling of 1578020747789 in words is "one trillion, five hundred seventy-eight billion, twenty million, seven hundred forty-seven thousand, seven hundred eighty-nine".