6621688847 has 2 divisors, whose sum is σ = 6621688848. Its totient is φ = 6621688846.

The previous prime is 6621688793. The next prime is 6621688861. The reversal of 6621688847 is 7488861266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6621688847 - 2¹⁸ = 6621426703 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6621688792 and 6621688801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6621688867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310844423 + 3310844424.

It is an arithmetic number, because the mean of its divisors is an integer number (3310844424).

Almost surely, 2^6621688847 is an apocalyptic number.

6621688847 is a deficient number, since it is larger than the sum of its proper divisors (1).

6621688847 is an equidigital number, since it uses as much as digits as its factorization.

6621688847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6193152, while the sum is 56.

The square root of 6621688847 is about 81373.7601871758. The cubic root of 6621688847 is about 1877.8299284435.

The spelling of 6621688847 in words is "six billion, six hundred twenty-one million, six hundred eighty-eight thousand, eight hundred forty-seven".