17640544868 has 6 divisors (see below), whose sum is σ = 30870953526. Its totient is φ = 8820272432.

The previous prime is 17640544843. The next prime is 17640544897. The reversal of 17640544868 is 86844504671.

It can be written as a sum of positive squares in only one way, i.e., 11312024164 + 6328520704 = 106358^2 + 79552^2 .

It is a super-2 number, since 2×17640544868² (a number of 21 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 2205068105 + ... + 2205068112.

It is an arithmetic number, because the mean of its divisors is an integer number (5145158921).

Almost surely, 2^17640544868 is an apocalyptic number.

It is an amenable number.

17640544868 is a deficient number, since it is larger than the sum of its proper divisors (13230408658).

17640544868 is a wasteful number, since it uses less digits than its factorization.

17640544868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4410136221 (or 4410136219 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 53.

The spelling of 17640544868 in words is "seventeen billion, six hundred forty million, five hundred forty-four thousand, eight hundred sixty-eight".