6684628957 has 2 divisors, whose sum is σ = 6684628958. Its totient is φ = 6684628956.

The previous prime is 6684628933. The next prime is 6684628961. The reversal of 6684628957 is 7598264866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6436692441 + 247936516 = 80229^2 + 15746^2 .

It is a cyclic number.

It is not a de Polignac number, because 6684628957 - 2¹¹ = 6684626909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6684628895 and 6684628904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6684626957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3342314478 + 3342314479.

It is an arithmetic number, because the mean of its divisors is an integer number (3342314479).

Almost surely, 2^6684628957 is an apocalyptic number.

It is an amenable number.

6684628957 is a deficient number, since it is larger than the sum of its proper divisors (1).

6684628957 is an equidigital number, since it uses as much as digits as its factorization.

6684628957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34836480, while the sum is 61.

The square root of 6684628957 is about 81759.5802154096. The cubic root of 6684628957 is about 1883.7608581693.

The spelling of 6684628957 in words is "six billion, six hundred eighty-four million, six hundred twenty-eight thousand, nine hundred fifty-seven".