17921279680 has 28 divisors (see below), whose sum is σ = 42675048000. Its totient is φ = 7168511744.

The previous prime is 17921279653. The next prime is 17921279687. The reversal of 17921279680 is 8697212971.

It is not an unprimeable number, because it can be changed into a prime (17921279687) 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, 28001680 + ... + 28002319.

Almost surely, 2^17921279680 is an apocalyptic number.

17921279680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

17921279680 is an abundant number, since it is smaller than the sum of its proper divisors (24753768320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17921279680 is an equidigital number, since it uses as much as digits as its factorization.

17921279680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56004016 (or 56004006 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 52.

The spelling of 17921279680 in words is "seventeen billion, nine hundred twenty-one million, two hundred seventy-nine thousand, six hundred eighty".