17649881005 has 4 divisors (see below), whose sum is σ = 21179857212. Its totient is φ = 14119904800.

The previous prime is 17649880991. The next prime is 17649881017. The reversal of 17649881005 is 50018894671.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50018894671 = 3109 ⋅16088419.

It can be written as a sum of positive squares in 2 ways, for example, as 6264564201 + 11385316804 = 79149^2 + 106702^2 .

It is not a de Polignac number, because 17649881005 - 2¹¹ = 17649878957 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 17649881005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1764988096 + ... + 1764988105.

It is an arithmetic number, because the mean of its divisors is an integer number (5294964303).

Almost surely, 2^17649881005 is an apocalyptic number.

It is an amenable number.

17649881005 is a deficient number, since it is larger than the sum of its proper divisors (3529976207).

17649881005 is an equidigital number, since it uses as much as digits as its factorization.

17649881005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529976206.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 17649881005 in words is "seventeen billion, six hundred forty-nine million, eight hundred eighty-one thousand, five".