660245081 has 2 divisors, whose sum is σ = 660245082. Its totient is φ = 660245080.

The previous prime is 660245077. The next prime is 660245083. The reversal of 660245081 is 180542066.

660245081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612067600 + 48177481 = 24740^2 + 6941^2 .

It is a cyclic number.

It is not a de Polignac number, because 660245081 - 2² = 660245077 is a prime.

It is a super-2 number, since 2×660245081² = 871847133969393122, which contains 22 as substring.

Together with 660245083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (660245083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330122540 + 330122541.

It is an arithmetic number, because the mean of its divisors is an integer number (330122541).

Almost surely, 2^660245081 is an apocalyptic number.

It is an amenable number.

660245081 is a deficient number, since it is larger than the sum of its proper divisors (1).

660245081 is an equidigital number, since it uses as much as digits as its factorization.

660245081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 660245081 is about 25695.2345970999. The cubic root of 660245081 is about 870.7665244281.

The spelling of 660245081 in words is "six hundred sixty million, two hundred forty-five thousand, eighty-one".