660811673 has 2 divisors, whose sum is σ = 660811674. Its totient is φ = 660811672.

The previous prime is 660811609. The next prime is 660811693. The reversal of 660811673 is 376118066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617423104 + 43388569 = 24848^2 + 6587^2 .

It is a cyclic number.

It is not a de Polignac number, because 660811673 - 2⁶ = 660811609 is a prime.

It is not a weakly prime, because it can be changed into another prime (660811693) 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, 330405836 + 330405837.

It is an arithmetic number, because the mean of its divisors is an integer number (330405837).

Almost surely, 2^660811673 is an apocalyptic number.

It is an amenable number.

660811673 is a deficient number, since it is larger than the sum of its proper divisors (1).

660811673 is an equidigital number, since it uses as much as digits as its factorization.

660811673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 660811673 is about 25706.2574677840. The cubic root of 660811673 is about 871.0155371553.

It can be divided in two parts, 6608 and 11673, that added together give a palindrome (18281).

The spelling of 660811673 in words is "six hundred sixty million, eight hundred eleven thousand, six hundred seventy-three".