66155505665159 has 2 divisors, whose sum is σ = 66155505665160. Its totient is φ = 66155505665158.

The previous prime is 66155505665099. The next prime is 66155505665201. The reversal of 66155505665159 is 95156650555166.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66155505665159 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 66155505665095 and 66155505665104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66155505668159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33077752832579 + 33077752832580.

It is an arithmetic number, because the mean of its divisors is an integer number (33077752832580).

Almost surely, 2^{66155505665159} is an apocalyptic number.

66155505665159 is a deficient number, since it is larger than the sum of its proper divisors (1).

66155505665159 is an equidigital number, since it uses as much as digits as its factorization.

66155505665159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 182250000, while the sum is 65.

The spelling of 66155505665159 in words is "sixty-six trillion, one hundred fifty-five billion, five hundred five million, six hundred sixty-five thousand, one hundred fifty-nine".