66930173749 has 2 divisors, whose sum is σ = 66930173750. Its totient is φ = 66930173748.

The previous prime is 66930173707. The next prime is 66930173759. The reversal of 66930173749 is 94737103966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65797380100 + 1132793649 = 256510^2 + 33657^2 .

It is a cyclic number.

It is not a de Polignac number, because 66930173749 - 2¹¹ = 66930171701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66930173749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66930173759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33465086874 + 33465086875.

It is an arithmetic number, because the mean of its divisors is an integer number (33465086875).

Almost surely, 2^66930173749 is an apocalyptic number.

It is an amenable number.

66930173749 is a deficient number, since it is larger than the sum of its proper divisors (1).

66930173749 is an equidigital number, since it uses as much as digits as its factorization.

66930173749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5143824, while the sum is 55.

The spelling of 66930173749 in words is "sixty-six billion, nine hundred thirty million, one hundred seventy-three thousand, seven hundred forty-nine".