660242461 has 2 divisors, whose sum is σ = 660242462. Its totient is φ = 660242460.

The previous prime is 660242459. The next prime is 660242491. The reversal of 660242461 is 164242066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643383225 + 16859236 = 25365^2 + 4106^2 .

It is a cyclic number.

It is not a de Polignac number, because 660242461 - 2¹ = 660242459 is a prime.

Together with 660242459, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660242411) 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, 330121230 + 330121231.

It is an arithmetic number, because the mean of its divisors is an integer number (330121231).

Almost surely, 2^660242461 is an apocalyptic number.

It is an amenable number.

660242461 is a deficient number, since it is larger than the sum of its proper divisors (1).

660242461 is an equidigital number, since it uses as much as digits as its factorization.

660242461 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 660242461 is about 25695.1836148333. The cubic root of 660242461 is about 870.7653726278.

The spelling of 660242461 in words is "six hundred sixty million, two hundred forty-two thousand, four hundred sixty-one".