1982786320289 has 4 divisors (see below), whose sum is σ = 1983016644420. Its totient is φ = 1982555996160.

The previous prime is 1982786320283. The next prime is 1982786320337. The reversal of 1982786320289 is 9820236872891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182506675264 + 1800279645025 = 427208^2 + 1341745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1982786320289 - 2¹² = 1982786316193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1982786320283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115149152 + ... + 115166369.

It is an arithmetic number, because the mean of its divisors is an integer number (495754161105).

Almost surely, 2^{1982786320289} is an apocalyptic number.

It is an amenable number.

1982786320289 is a deficient number, since it is larger than the sum of its proper divisors (230324131).

1982786320289 is an equidigital number, since it uses as much as digits as its factorization.

1982786320289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230324130.

The product of its (nonzero) digits is 41803776, while the sum is 65.

The spelling of 1982786320289 in words is "one trillion, nine hundred eighty-two billion, seven hundred eighty-six million, three hundred twenty thousand, two hundred eighty-nine".