665555555627 has 2 divisors, whose sum is σ = 665555555628. Its totient is φ = 665555555626.

The previous prime is 665555555557. The next prime is 665555555711. The reversal of 665555555627 is 726555555566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665555555627 - 2¹⁶ = 665555490091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665555555627.

It is not a weakly prime, because it can be changed into another prime (665555555527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332777777813 + 332777777814.

It is an arithmetic number, because the mean of its divisors is an integer number (332777777814).

Almost surely, 2^665555555627 is an apocalyptic number.

665555555627 is a deficient number, since it is larger than the sum of its proper divisors (1).

665555555627 is an equidigital number, since it uses as much as digits as its factorization.

665555555627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 236250000, while the sum is 62.

The spelling of 665555555627 in words is "six hundred sixty-five billion, five hundred fifty-five million, five hundred fifty-five thousand, six hundred twenty-seven".