660646073 has 2 divisors, whose sum is σ = 660646074. Its totient is φ = 660646072.

The previous prime is 660646039. The next prime is 660646097. The reversal of 660646073 is 370646066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 586220944 + 74425129 = 24212^2 + 8627^2 .

It is a cyclic number.

It is not a de Polignac number, because 660646073 - 2¹⁴ = 660629689 is a prime.

It is not a weakly prime, because it can be changed into another prime (660646373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330323036 + 330323037.

It is an arithmetic number, because the mean of its divisors is an integer number (330323037).

Almost surely, 2^660646073 is an apocalyptic number.

It is an amenable number.

660646073 is a deficient number, since it is larger than the sum of its proper divisors (1).

660646073 is an equidigital number, since it uses as much as digits as its factorization.

660646073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 38.

The square root of 660646073 is about 25703.0362603331. The cubic root of 660646073 is about 870.9427719842.

The spelling of 660646073 in words is "six hundred sixty million, six hundred forty-six thousand, seventy-three".