19716688537 has 16 divisors (see below), whose sum is σ = 24354330112. Its totient is φ = 15543679680.

The previous prime is 19716688529. The next prime is 19716688543. The reversal of 19716688537 is 73588661791.

It is a cyclic number.

It is not a de Polignac number, because 19716688537 - 2³ = 19716688529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19716688507) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 365889 + ... + 416302.

It is an arithmetic number, because the mean of its divisors is an integer number (1522145632).

Almost surely, 2^19716688537 is an apocalyptic number.

It is an amenable number.

19716688537 is a deficient number, since it is larger than the sum of its proper divisors (4637641575).

19716688537 is a wasteful number, since it uses less digits than its factorization.

19716688537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782488.

The product of its digits is 15240960, while the sum is 61.

The spelling of 19716688537 in words is "nineteen billion, seven hundred sixteen million, six hundred eighty-eight thousand, five hundred thirty-seven".