66456947 has 2 divisors, whose sum is σ = 66456948. Its totient is φ = 66456946.

The previous prime is 66456911. The next prime is 66456967. The reversal of 66456947 is 74965466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66456947 - 2⁶ = 66456883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66456967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33228473 + 33228474.

It is an arithmetic number, because the mean of its divisors is an integer number (33228474).

Almost surely, 2^66456947 is an apocalyptic number.

66456947 is a deficient number, since it is larger than the sum of its proper divisors (1).

66456947 is an equidigital number, since it uses as much as digits as its factorization.

66456947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 47.

The square root of 66456947 is about 8152.1130389611. The cubic root of 66456947 is about 405.0545006166.

The spelling of 66456947 in words is "sixty-six million, four hundred fifty-six thousand, nine hundred forty-seven".