166515500005 has 4 divisors (see below), whose sum is σ = 199818600012. Its totient is φ = 133212400000.

The previous prime is 166515499999. The next prime is 166515500029. The reversal of 166515500005 is 500005515661.

166515500005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500005515661 = 457 ⋅1094103973.

It can be written as a sum of positive squares in 2 ways, for example, as 116088755524 + 50426744481 = 340718^2 + 224559^2 .

It is not a de Polignac number, because 166515500005 - 2⁷ = 166515499877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16651549996 + ... + 16651550005.

It is an arithmetic number, because the mean of its divisors is an integer number (49954650003).

Almost surely, 2^166515500005 is an apocalyptic number.

It is an amenable number.

166515500005 is a deficient number, since it is larger than the sum of its proper divisors (33303100007).

166515500005 is an equidigital number, since it uses as much as digits as its factorization.

166515500005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33303100006.

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 166515500005 in words is "one hundred sixty-six billion, five hundred fifteen million, five hundred thousand, five".