166516606406519 has 2 divisors, whose sum is σ = 166516606406520. Its totient is φ = 166516606406518.

The previous prime is 166516606406503. The next prime is 166516606406531. The reversal of 166516606406519 is 915604606615661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166516606406519 - 2⁴ = 166516606406503 is a prime.

It is a super-2 number, since 2×166516606406519² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166516606403519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83258303203259 + 83258303203260.

It is an arithmetic number, because the mean of its divisors is an integer number (83258303203260).

Almost surely, 2^{166516606406519} is an apocalyptic number.

166516606406519 is a deficient number, since it is larger than the sum of its proper divisors (1).

166516606406519 is an equidigital number, since it uses as much as digits as its factorization.

166516606406519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41990400, while the sum is 62.

The spelling of 166516606406519 in words is "one hundred sixty-six trillion, five hundred sixteen billion, six hundred six million, four hundred six thousand, five hundred nineteen".