17999978896 has 45 divisors (see below), whose sum is σ = 37065888451. Its totient is φ = 8466285056.

The previous prime is 17999978891. The next prime is 17999978897. The reversal of 17999978896 is 69887999971.

The square root of 17999978896 is 134164.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1073296 + 17998905600 = 1036^2 + 134160^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17999978891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9122166 + ... + 9124138.

Almost surely, 2^17999978896 is an apocalyptic number.

17999978896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

17999978896 is the 134164-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17999978896

17999978896 is an abundant number, since it is smaller than the sum of its proper divisors (19065909555).

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

17999978896 is an frugal number, since it uses more digits than its factorization.

17999978896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3988 (or 1992 counting only the distinct ones).

The product of its digits is 1111065984, while the sum is 82.

The spelling of 17999978896 in words is "seventeen billion, nine hundred ninety-nine million, nine hundred seventy-eight thousand, eight hundred ninety-six".