660515117 has 2 divisors, whose sum is σ = 660515118. Its totient is φ = 660515116.

The previous prime is 660515077. The next prime is 660515143. The reversal of 660515117 is 711515066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 658743556 + 1771561 = 25666^2 + 1331^2 .

It is a cyclic number.

It is not a de Polignac number, because 660515117 - 2¹⁴ = 660498733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660515197) 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, 330257558 + 330257559.

It is an arithmetic number, because the mean of its divisors is an integer number (330257559).

Almost surely, 2^660515117 is an apocalyptic number.

It is an amenable number.

660515117 is a deficient number, since it is larger than the sum of its proper divisors (1).

660515117 is an equidigital number, since it uses as much as digits as its factorization.

660515117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 660515117 is about 25700.4886529420. The cubic root of 660515117 is about 870.8852208872.

The spelling of 660515117 in words is "six hundred sixty million, five hundred fifteen thousand, one hundred seventeen".