66673723 has 2 divisors, whose sum is σ = 66673724. Its totient is φ = 66673722.

The previous prime is 66673687. The next prime is 66673751. The reversal of 66673723 is 32737666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66673723 is a prime.

It is not a weakly prime, because it can be changed into another prime (66673423) 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, 33336861 + 33336862.

It is an arithmetic number, because the mean of its divisors is an integer number (33336862).

Almost surely, 2^66673723 is an apocalyptic number.

66673723 is a deficient number, since it is larger than the sum of its proper divisors (1).

66673723 is an equidigital number, since it uses as much as digits as its factorization.

66673723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 40.

The square root of 66673723 is about 8165.3979082467. The cubic root of 66673723 is about 405.4944385484.

The spelling of 66673723 in words is "sixty-six million, six hundred seventy-three thousand, seven hundred twenty-three".