19715317128 has 48 divisors (see below), whose sum is σ = 57503011020. Its totient is φ = 6066251136.

The previous prime is 19715317117. The next prime is 19715317147. The reversal of 19715317128 is 82171351791.

19715317128 is a `hidden beast` number, since 1 + 97 + 1 + 531 + 7 + 1 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19438494084 + 276823044 = 139422^2 + 16638^2 .

It is a super-2 number, since 2×19715317128² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10530751 + ... + 10532622.

Almost surely, 2^19715317128 is an apocalyptic number.

19715317128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19715317128 is an abundant number, since it is smaller than the sum of its proper divisors (37787693892).

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

19715317128 is a wasteful number, since it uses less digits than its factorization.

19715317128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21063398 (or 21063391 counting only the distinct ones).

The product of its digits is 105840, while the sum is 45.

The spelling of 19715317128 in words is "nineteen billion, seven hundred fifteen million, three hundred seventeen thousand, one hundred twenty-eight".