6628469381 has 2 divisors, whose sum is σ = 6628469382. Its totient is φ = 6628469380.

The previous prime is 6628469359. The next prime is 6628469387. The reversal of 6628469381 is 1839648266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3651784900 + 2976684481 = 60430^2 + 54559^2 .

It is a cyclic number.

It is not a de Polignac number, because 6628469381 - 2⁶ = 6628469317 is a prime.

It is a super-2 number, since 2×6628469381² = 87873212669709046322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6628469387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3314234690 + 3314234691.

It is an arithmetic number, because the mean of its divisors is an integer number (3314234691).

Almost surely, 2^6628469381 is an apocalyptic number.

It is an amenable number.

6628469381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6628469381 is an equidigital number, since it uses as much as digits as its factorization.

6628469381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 53.

The square root of 6628469381 is about 81415.4124290972. The cubic root of 6628469381 is about 1878.4706686130.

The spelling of 6628469381 in words is "six billion, six hundred twenty-eight million, four hundred sixty-nine thousand, three hundred eighty-one".