1982808013681 has 4 divisors (see below), whose sum is σ = 2163063287664. Its totient is φ = 1802552739700.

The previous prime is 1982808013663. The next prime is 1982808013717. The reversal of 1982808013681 is 1863108082891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1982808013681 - 2⁵ = 1982808013649 is a prime.

It is a super-2 number, since 2×1982808013681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1982808013661) 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, 90127636975 + ... + 90127636996.

It is an arithmetic number, because the mean of its divisors is an integer number (540765821916).

Almost surely, 2^{1982808013681} is an apocalyptic number.

1982808013681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1982808013681 is a deficient number, since it is larger than the sum of its proper divisors (180255273983).

1982808013681 is a wasteful number, since it uses less digits than its factorization.

1982808013681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180255273982.

The product of its (nonzero) digits is 1327104, while the sum is 55.

The spelling of 1982808013681 in words is "one trillion, nine hundred eighty-two billion, eight hundred eight million, thirteen thousand, six hundred eighty-one".