11982982861 has 2 divisors, whose sum is σ = 11982982862. Its totient is φ = 11982982860.

The previous prime is 11982982859. The next prime is 11982982877. The reversal of 11982982861 is 16828928911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11361428100 + 621554761 = 106590^2 + 24931^2 .

It is a cyclic number.

It is not a de Polignac number, because 11982982861 - 2¹ = 11982982859 is a prime.

Together with 11982982859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11982982811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5991491430 + 5991491431.

It is an arithmetic number, because the mean of its divisors is an integer number (5991491431).

Almost surely, 2^11982982861 is an apocalyptic number.

It is an amenable number.

11982982861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11982982861 is an equidigital number, since it uses as much as digits as its factorization.

11982982861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 55.

The spelling of 11982982861 in words is "eleven billion, nine hundred eighty-two million, nine hundred eighty-two thousand, eight hundred sixty-one".