1020997765589 has 2 divisors, whose sum is σ = 1020997765590. Its totient is φ = 1020997765588.

The previous prime is 1020997765561. The next prime is 1020997765609. The reversal of 1020997765589 is 9855677990201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 980119800100 + 40877965489 = 990010^2 + 202183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020997765589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020997765889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510498882794 + 510498882795.

It is an arithmetic number, because the mean of its divisors is an integer number (510498882795).

Almost surely, 2^{1020997765589} is an apocalyptic number.

It is an amenable number.

1020997765589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020997765589 is an equidigital number, since it uses as much as digits as its factorization.

1020997765589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 85730400, while the sum is 68.

The spelling of 1020997765589 in words is "one trillion, twenty billion, nine hundred ninety-seven million, seven hundred sixty-five thousand, five hundred eighty-nine".