6657947 has 2 divisors, whose sum is σ = 6657948. Its totient is φ = 6657946.

The previous prime is 6657929. The next prime is 6657953. The reversal of 6657947 is 7497566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6657947 - 2¹⁴ = 6641563 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6657898 and 6657907.

It is not a weakly prime, because it can be changed into another prime (6657997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328973 + 3328974.

It is an arithmetic number, because the mean of its divisors is an integer number (3328974).

Almost surely, 2^6657947 is an apocalyptic number.

6657947 is a deficient number, since it is larger than the sum of its proper divisors (1).

6657947 is an equidigital number, since it uses as much as digits as its factorization.

6657947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 44.

The square root of 6657947 is about 2580.2997887842. The cubic root of 6657947 is about 188.1251147706.

It can be divided in two parts, 66579 and 47, that multiplied together give a palindrome (3129213).

The spelling of 6657947 in words is "six million, six hundred fifty-seven thousand, nine hundred forty-seven".