660868168687 has 2 divisors, whose sum is σ = 660868168688. Its totient is φ = 660868168686.

The previous prime is 660868168663. The next prime is 660868168691. The reversal of 660868168687 is 786861868066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660868168687 - 2¹⁹ = 660867644399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660868168787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330434084343 + 330434084344.

It is an arithmetic number, because the mean of its divisors is an integer number (330434084344).

Almost surely, 2^660868168687 is an apocalyptic number.

660868168687 is a deficient number, since it is larger than the sum of its proper divisors (1).

660868168687 is an equidigital number, since it uses as much as digits as its factorization.

660868168687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 222953472, while the sum is 70.

The spelling of 660868168687 in words is "six hundred sixty billion, eight hundred sixty-eight million, one hundred sixty-eight thousand, six hundred eighty-seven".