66693793 has 2 divisors, whose sum is σ = 66693794. Its totient is φ = 66693792.

The previous prime is 66693791. The next prime is 66693811. The reversal of 66693793 is 39739666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65804544 + 889249 = 8112^2 + 943^2 .

It is a cyclic number.

It is not a de Polignac number, because 66693793 - 2¹ = 66693791 is a prime.

Together with 66693791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66693791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33346896 + 33346897.

It is an arithmetic number, because the mean of its divisors is an integer number (33346897).

Almost surely, 2^66693793 is an apocalyptic number.

It is an amenable number.

66693793 is a deficient number, since it is larger than the sum of its proper divisors (1).

66693793 is an equidigital number, since it uses as much as digits as its factorization.

66693793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 49.

The square root of 66693793 is about 8166.6267822155. The cubic root of 66693793 is about 405.5351215270.

The spelling of 66693793 in words is "sixty-six million, six hundred ninety-three thousand, seven hundred ninety-three".