1980555547489 has 2 divisors, whose sum is σ = 1980555547490. Its totient is φ = 1980555547488.

The previous prime is 1980555547391. The next prime is 1980555547571. The reversal of 1980555547489 is 9847455550891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1821028797025 + 159526750464 = 1349455^2 + 399408^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980555547489 - 2²⁹ = 1980018676577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1980555647489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990277773744 + 990277773745.

It is an arithmetic number, because the mean of its divisors is an integer number (990277773745).

Almost surely, 2^{1980555547489} is an apocalyptic number.

It is an amenable number.

1980555547489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980555547489 is an equidigital number, since it uses as much as digits as its factorization.

1980555547489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880000, while the sum is 70.

The spelling of 1980555547489 in words is "one trillion, nine hundred eighty billion, five hundred fifty-five million, five hundred forty-seven thousand, four hundred eighty-nine".