166665065513 has 2 divisors, whose sum is σ = 166665065514. Its totient is φ = 166665065512.

The previous prime is 166665065461. The next prime is 166665065537. The reversal of 166665065513 is 315560566661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151977564649 + 14687500864 = 389843^2 + 121192^2 .

It is a cyclic number.

It is not a de Polignac number, because 166665065513 - 2²⁴ = 166648288297 is a prime.

It is not a weakly prime, because it can be changed into another prime (166665065543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83332532756 + 83332532757.

It is an arithmetic number, because the mean of its divisors is an integer number (83332532757).

Almost surely, 2^166665065513 is an apocalyptic number.

It is an amenable number.

166665065513 is a deficient number, since it is larger than the sum of its proper divisors (1).

166665065513 is an equidigital number, since it uses as much as digits as its factorization.

166665065513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916000, while the sum is 50.

The spelling of 166665065513 in words is "one hundred sixty-six billion, six hundred sixty-five million, sixty-five thousand, five hundred thirteen".