66946723 has 2 divisors, whose sum is σ = 66946724. Its totient is φ = 66946722.

The previous prime is 66946687. The next prime is 66946729. The reversal of 66946723 is 32764966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66946723 - 2⁹ = 66946211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66946723.

It is not a weakly prime, because it can be changed into another prime (66946729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33473361 + 33473362.

It is an arithmetic number, because the mean of its divisors is an integer number (33473362).

Almost surely, 2^66946723 is an apocalyptic number.

66946723 is a deficient number, since it is larger than the sum of its proper divisors (1).

66946723 is an equidigital number, since it uses as much as digits as its factorization.

66946723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 43.

The square root of 66946723 is about 8182.0977139118. The cubic root of 66946723 is about 406.0471262242.

The spelling of 66946723 in words is "sixty-six million, nine hundred forty-six thousand, seven hundred twenty-three".