66916723 has 2 divisors, whose sum is σ = 66916724. Its totient is φ = 66916722.

The previous prime is 66916721. The next prime is 66916741. The reversal of 66916723 is 32761966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66916723 - 2¹ = 66916721 is a prime.

Together with 66916721, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66916721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33458361 + 33458362.

It is an arithmetic number, because the mean of its divisors is an integer number (33458362).

Almost surely, 2^66916723 is an apocalyptic number.

66916723 is a deficient number, since it is larger than the sum of its proper divisors (1).

66916723 is an equidigital number, since it uses as much as digits as its factorization.

66916723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The square root of 66916723 is about 8180.2642377860. The cubic root of 66916723 is about 405.9864648840.

The spelling of 66916723 in words is "sixty-six million, nine hundred sixteen thousand, seven hundred twenty-three".