17827916845 has 4 divisors (see below), whose sum is σ = 21393500220. Its totient is φ = 14262333472.

The previous prime is 17827916839. The next prime is 17827916903. The reversal of 17827916845 is 54861972871.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54861972871 = 4877 ⋅11249123.

It can be written as a sum of positive squares in 2 ways, for example, as 10833270889 + 6994645956 = 104083^2 + 83634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17827916845 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 17827916845.

It is a congruent number.

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, 1782791680 + ... + 1782791689.

It is an arithmetic number, because the mean of its divisors is an integer number (5348375055).

Almost surely, 2^17827916845 is an apocalyptic number.

It is an amenable number.

17827916845 is a deficient number, since it is larger than the sum of its proper divisors (3565583375).

17827916845 is an equidigital number, since it uses as much as digits as its factorization.

17827916845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565583374.

The product of its digits is 6773760, while the sum is 58.

The spelling of 17827916845 in words is "seventeen billion, eight hundred twenty-seven million, nine hundred sixteen thousand, eight hundred forty-five".