66947953 has 2 divisors, whose sum is σ = 66947954. Its totient is φ = 66947952.

The previous prime is 66947899. The next prime is 66947977. The reversal of 66947953 is 35974966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55845729 + 11102224 = 7473^2 + 3332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66947953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66947897 and 66947906.

It is not a weakly prime, because it can be changed into another prime (66947753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33473976 + 33473977.

It is an arithmetic number, because the mean of its divisors is an integer number (33473977).

Almost surely, 2^66947953 is an apocalyptic number.

It is an amenable number.

66947953 is a deficient number, since it is larger than the sum of its proper divisors (1).

66947953 is an equidigital number, since it uses as much as digits as its factorization.

66947953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 49.

The square root of 66947953 is about 8182.1728776652. The cubic root of 66947953 is about 406.0496129523.

The spelling of 66947953 in words is "sixty-six million, nine hundred forty-seven thousand, nine hundred fifty-three".