16464427381 has 2 divisors, whose sum is σ = 16464427382. Its totient is φ = 16464427380.

The previous prime is 16464427379. The next prime is 16464427403. The reversal of 16464427381 is 18372446461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16439086225 + 25341156 = 128215^2 + 5034^2 .

It is a cyclic number.

It is not a de Polignac number, because 16464427381 - 2¹ = 16464427379 is a prime.

It is a super-2 number, since 2×16464427381² (a number of 21 digits) contains 22 as substring.

Together with 16464427379, 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 (16464487381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8232213690 + 8232213691.

It is an arithmetic number, because the mean of its divisors is an integer number (8232213691).

Almost surely, 2^16464427381 is an apocalyptic number.

It is an amenable number.

16464427381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16464427381 is an equidigital number, since it uses as much as digits as its factorization.

16464427381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 46.

The spelling of 16464427381 in words is "sixteen billion, four hundred sixty-four million, four hundred twenty-seven thousand, three hundred eighty-one".