981864669013 has 2 divisors, whose sum is σ = 981864669014. Its totient is φ = 981864669012.

The previous prime is 981864669011. The next prime is 981864669047. The reversal of 981864669013 is 310966468189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 762684329124 + 219180339889 = 873318^2 + 468167^2 .

It is a cyclic number.

It is not a de Polignac number, because 981864669013 - 2¹ = 981864669011 is a prime.

Together with 981864669011, 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 (981864669011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490932334506 + 490932334507.

It is an arithmetic number, because the mean of its divisors is an integer number (490932334507).

Almost surely, 2^981864669013 is an apocalyptic number.

It is an amenable number.

981864669013 is a deficient number, since it is larger than the sum of its proper divisors (1).

981864669013 is an equidigital number, since it uses as much as digits as its factorization.

981864669013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13436928, while the sum is 61.

The spelling of 981864669013 in words is "nine hundred eighty-one billion, eight hundred sixty-four million, six hundred sixty-nine thousand, thirteen".