19975207688 has 36 divisors (see below), whose sum is σ = 37887948735. Its totient is φ = 9873074896.

The previous prime is 19975207657. The next prime is 19975207711. The reversal of 19975207688 is 88670257991.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 9987603844 + 9987603844 = 99938^2 + 99938^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=99938.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19975207688.

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 in 8 ways as a sum of consecutive naturals, for example, 42773231 + ... + 42773697.

Almost surely, 2^19975207688 is an apocalyptic number.

It is an amenable number.

19975207688 is a deficient number, since it is larger than the sum of its proper divisors (17912741047).

19975207688 is an frugal number, since it uses more digits than its factorization.

19975207688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 576 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 19975207688 in words is "nineteen billion, nine hundred seventy-five million, two hundred seven thousand, six hundred eighty-eight".