19875281680 has 20 divisors (see below), whose sum is σ = 46210030092. Its totient is φ = 7950112640.

The previous prime is 19875281677. The next prime is 19875281681. The reversal of 19875281680 is 8618257891.

It can be written as a sum of positive squares in 2 ways, for example, as 13523829264 + 6351452416 = 116292^2 + 79696^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (19875281681) 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 3 ways as a sum of consecutive naturals, for example, 124220431 + ... + 124220590.

Almost surely, 2^19875281680 is an apocalyptic number.

19875281680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19875281680 is an abundant number, since it is smaller than the sum of its proper divisors (26334748412).

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

19875281680 is a wasteful number, since it uses less digits than its factorization.

19875281680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248441034 (or 248441028 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 55.

The spelling of 19875281680 in words is "nineteen billion, eight hundred seventy-five million, two hundred eighty-one thousand, six hundred eighty".