66105115059999 has 16 divisors (see below), whose sum is σ = 88244621465600. Its totient is φ = 44017844846976.

The previous prime is 66105115059979. The next prime is 66105115060001. The reversal of 66105115059999 is 99995051150166.

It is not a de Polignac number, because 66105115059999 - 2⁵ = 66105115059967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66105115059979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135159207 + ... + 135647415.

It is an arithmetic number, because the mean of its divisors is an integer number (5515288841600).

Almost surely, 2^{66105115059999} is an apocalyptic number.

66105115059999 is a deficient number, since it is larger than the sum of its proper divisors (22139506405601).

66105115059999 is a wasteful number, since it uses less digits than its factorization.

66105115059999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541614.

The product of its (nonzero) digits is 29524500, while the sum is 66.

The spelling of 66105115059999 in words is "sixty-six trillion, one hundred five billion, one hundred fifteen million, fifty-nine thousand, nine hundred ninety-nine".