660244261 has 2 divisors, whose sum is σ = 660244262. Its totient is φ = 660244260.

The previous prime is 660244241. The next prime is 660244289. The reversal of 660244261 is 162442066.

660244261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660233025 + 11236 = 25695^2 + 106^2 .

It is a cyclic number.

It is not a de Polignac number, because 660244261 - 2⁵ = 660244229 is a prime.

It is a super-2 number, since 2×660244261² = 871844968366872242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660244241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330122130 + 330122131.

It is an arithmetic number, because the mean of its divisors is an integer number (330122131).

Almost surely, 2^660244261 is an apocalyptic number.

It is an amenable number.

660244261 is a deficient number, since it is larger than the sum of its proper divisors (1).

660244261 is an equidigital number, since it uses as much as digits as its factorization.

660244261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 660244261 is about 25695.2186408289. The cubic root of 660244261 is about 870.7661639413.

The spelling of 660244261 in words is "six hundred sixty million, two hundred forty-four thousand, two hundred sixty-one".