19787718514 has 16 divisors (see below), whose sum is σ = 31453191000. Its totient is φ = 9304271104.

The previous prime is 19787718499. The next prime is 19787718581. The reversal of 19787718514 is 41581778791.

It can be written as a sum of positive squares in 4 ways, for example, as 18546354225 + 1241364289 = 136185^2 + 35233^2 .

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 7 ways as a sum of consecutive naturals, for example, 194989 + ... + 278560.

Almost surely, 2^19787718514 is an apocalyptic number.

19787718514 is a deficient number, since it is larger than the sum of its proper divisors (11665472486).

19787718514 is a wasteful number, since it uses less digits than its factorization.

19787718514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474797.

The product of its digits is 3951360, while the sum is 58.

The spelling of 19787718514 in words is "nineteen billion, seven hundred eighty-seven million, seven hundred eighteen thousand, five hundred fourteen".