17661206672 has 20 divisors (see below), whose sum is σ = 34242086640. Its totient is φ = 8824539168.

The previous prime is 17661206669. The next prime is 17661206677. The reversal of 17661206672 is 27660216671.

It is a super-4 number, since 4×17661206672⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (17661206677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354938 + ... + 401625.

It is an arithmetic number, because the mean of its divisors is an integer number (1712104332).

Almost surely, 2^17661206672 is an apocalyptic number.

It is an amenable number.

17661206672 is a deficient number, since it is larger than the sum of its proper divisors (16580879968).

17661206672 is a wasteful number, since it uses less digits than its factorization.

17661206672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758030 (or 758024 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

Subtracting 17661206672 from its reverse (27660216671), we obtain a palindrome (9999009999).

The spelling of 17661206672 in words is "seventeen billion, six hundred sixty-one million, two hundred six thousand, six hundred seventy-two".