6624511381 has 2 divisors, whose sum is σ = 6624511382. Its totient is φ = 6624511380.

The previous prime is 6624511379. The next prime is 6624511403. The reversal of 6624511381 is 1831154266.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5238140625 + 1386370756 = 72375^2 + 37234^2 .

It is a cyclic number.

It is not a de Polignac number, because 6624511381 - 2¹ = 6624511379 is a prime.

It is a super-2 number, since 2×6624511381² = 87768302073997054322, which contains 22 as substring.

Together with 6624511379, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6624511381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6624511331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3312255690 + 3312255691.

It is an arithmetic number, because the mean of its divisors is an integer number (3312255691).

Almost surely, 2^6624511381 is an apocalyptic number.

It is an amenable number.

6624511381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6624511381 is an equidigital number, since it uses as much as digits as its factorization.

6624511381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 6624511381 is about 81391.1013624954. The cubic root of 6624511381 is about 1878.0967025769.

The spelling of 6624511381 in words is "six billion, six hundred twenty-four million, five hundred eleven thousand, three hundred eighty-one".