660768133 has 2 divisors, whose sum is σ = 660768134. Its totient is φ = 660768132.

The previous prime is 660768113. The next prime is 660768167. The reversal of 660768133 is 331867066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 608016964 + 52751169 = 24658^2 + 7263^2 .

It is a cyclic number.

It is not a de Polignac number, because 660768133 - 2²⁵ = 627213701 is a prime.

It is a super-2 number, since 2×660768133² = 873229051176611378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660768113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330384066 + 330384067.

It is an arithmetic number, because the mean of its divisors is an integer number (330384067).

Almost surely, 2^660768133 is an apocalyptic number.

It is an amenable number.

660768133 is a deficient number, since it is larger than the sum of its proper divisors (1).

660768133 is an equidigital number, since it uses as much as digits as its factorization.

660768133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 660768133 is about 25705.4105783199. The cubic root of 660768133 is about 870.9964067177.

The spelling of 660768133 in words is "six hundred sixty million, seven hundred sixty-eight thousand, one hundred thirty-three".