660242057 has 2 divisors, whose sum is σ = 660242058. Its totient is φ = 660242056.

The previous prime is 660242047. The next prime is 660242069. The reversal of 660242057 is 750242066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401160841 + 259081216 = 20029^2 + 16096^2 .

It is a cyclic number.

It is not a de Polignac number, because 660242057 - 2²² = 656047753 is a prime.

It is not a weakly prime, because it can be changed into another prime (660242017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330121028 + 330121029.

It is an arithmetic number, because the mean of its divisors is an integer number (330121029).

Almost surely, 2^660242057 is an apocalyptic number.

It is an amenable number.

660242057 is a deficient number, since it is larger than the sum of its proper divisors (1).

660242057 is an equidigital number, since it uses as much as digits as its factorization.

660242057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 660242057 is about 25695.1757534367. The cubic root of 660242057 is about 870.7651950217.

Subtracting 660242057 from its reverse (750242066), we obtain a palindrome (90000009).

The spelling of 660242057 in words is "six hundred sixty million, two hundred forty-two thousand, fifty-seven".