1980555547123 has 2 divisors, whose sum is σ = 1980555547124. Its totient is φ = 1980555547122.

The previous prime is 1980555547081. The next prime is 1980555547129. The reversal of 1980555547123 is 3217455550891.

It is a strong prime.

It is an emirp because it is prime and its reverse (3217455550891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1980555547123 - 2¹³ = 1980555538931 is a prime.

It is not a weakly prime, because it can be changed into another prime (1980555547129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990277773561 + 990277773562.

It is an arithmetic number, because the mean of its divisors is an integer number (990277773562).

Almost surely, 2^{1980555547123} is an apocalyptic number.

1980555547123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980555547123 is an equidigital number, since it uses as much as digits as its factorization.

1980555547123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560000, while the sum is 55.

The spelling of 1980555547123 in words is "one trillion, nine hundred eighty billion, five hundred fifty-five million, five hundred forty-seven thousand, one hundred twenty-three".