166001506165577 has 2 divisors, whose sum is σ = 166001506165578. Its totient is φ = 166001506165576.

The previous prime is 166001506165529. The next prime is 166001506165633. The reversal of 166001506165577 is 775561605100661.

It is a happy number.

It is an a-pointer prime, because the next prime (166001506165633) can be obtained adding 166001506165577 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142864742380816 + 23136763784761 = 11952604^2 + 4810069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166001506165577 is a prime.

It is not a weakly prime, because it can be changed into another prime (166001506167577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83000753082788 + 83000753082789.

It is an arithmetic number, because the mean of its divisors is an integer number (83000753082789).

Almost surely, 2^{166001506165577} is an apocalyptic number.

It is an amenable number.

166001506165577 is a deficient number, since it is larger than the sum of its proper divisors (1).

166001506165577 is an equidigital number, since it uses as much as digits as its factorization.

166001506165577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938000, while the sum is 56.

The spelling of 166001506165577 in words is "one hundred sixty-six trillion, one billion, five hundred six million, one hundred sixty-five thousand, five hundred seventy-seven".