16866606305 has 4 divisors (see below), whose sum is σ = 20239927572. Its totient is φ = 13493285040.

The previous prime is 16866606293. The next prime is 16866606311. The reversal of 16866606305 is 50360666861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50360666861 = 1367 ⋅36840283.

It can be written as a sum of positive squares in 2 ways, for example, as 12729029329 + 4137576976 = 112823^2 + 64324^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16866606305 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16866606305.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1686660626 + ... + 1686660635.

It is an arithmetic number, because the mean of its divisors is an integer number (5059981893).

Almost surely, 2^16866606305 is an apocalyptic number.

It is an amenable number.

16866606305 is a deficient number, since it is larger than the sum of its proper divisors (3373321267).

16866606305 is an equidigital number, since it uses as much as digits as its factorization.

16866606305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373321266.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 16866606305 in words is "sixteen billion, eight hundred sixty-six million, six hundred six thousand, three hundred five".