165600566557 has 2 divisors, whose sum is σ = 165600566558. Its totient is φ = 165600566556.

The previous prime is 165600566539. The next prime is 165600566597. The reversal of 165600566557 is 755665006561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85974449796 + 79626116761 = 293214^2 + 282181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165600566557 is a prime.

It is a super-3 number, since 3×165600566557³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165600566597) 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, 82800283278 + 82800283279.

It is an arithmetic number, because the mean of its divisors is an integer number (82800283279).

Almost surely, 2^165600566557 is an apocalyptic number.

It is an amenable number.

165600566557 is a deficient number, since it is larger than the sum of its proper divisors (1).

165600566557 is an equidigital number, since it uses as much as digits as its factorization.

165600566557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670000, while the sum is 52.

The spelling of 165600566557 in words is "one hundred sixty-five billion, six hundred million, five hundred sixty-six thousand, five hundred fifty-seven".