16379449981 has 2 divisors, whose sum is σ = 16379449982. Its totient is φ = 16379449980.

The previous prime is 16379449979. The next prime is 16379449991. The reversal of 16379449981 is 18994497361.

16379449981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10492724356 + 5886725625 = 102434^2 + 76725^2 .

It is a cyclic number.

It is not a de Polignac number, because 16379449981 - 2¹ = 16379449979 is a prime.

It is a super-3 number, since 3×16379449981³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 16379449979, 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 (16379449921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8189724990 + 8189724991.

It is an arithmetic number, because the mean of its divisors is an integer number (8189724991).

Almost surely, 2^16379449981 is an apocalyptic number.

It is an amenable number.

16379449981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16379449981 is an equidigital number, since it uses as much as digits as its factorization.

16379449981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 61.

The spelling of 16379449981 in words is "sixteen billion, three hundred seventy-nine million, four hundred forty-nine thousand, nine hundred eighty-one".