66947707 has 2 divisors, whose sum is σ = 66947708. Its totient is φ = 66947706.

The previous prime is 66947701. The next prime is 66947723. The reversal of 66947707 is 70774966.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66947707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66947701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33473853 + 33473854.

It is an arithmetic number, because the mean of its divisors is an integer number (33473854).

Almost surely, 2^66947707 is an apocalyptic number.

66947707 is a deficient number, since it is larger than the sum of its proper divisors (1).

66947707 is an equidigital number, since it uses as much as digits as its factorization.

66947707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 444528, while the sum is 46.

The square root of 66947707 is about 8182.1578449697. The cubic root of 66947707 is about 406.0491156091.

The spelling of 66947707 in words is "sixty-six million, nine hundred forty-seven thousand, seven hundred seven".