665541593887 has 2 divisors, whose sum is σ = 665541593888. Its totient is φ = 665541593886.

The previous prime is 665541593833. The next prime is 665541593903. The reversal of 665541593887 is 788395145566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665541593887 is a prime.

It is a super-2 number, since 2×665541593887² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665541513887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332770796943 + 332770796944.

It is an arithmetic number, because the mean of its divisors is an integer number (332770796944).

Almost surely, 2^665541593887 is an apocalyptic number.

665541593887 is a deficient number, since it is larger than the sum of its proper divisors (1).

665541593887 is an equidigital number, since it uses as much as digits as its factorization.

665541593887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728000, while the sum is 67.

The spelling of 665541593887 in words is "six hundred sixty-five billion, five hundred forty-one million, five hundred ninety-three thousand, eight hundred eighty-seven".