19787799929104 has 15 divisors (see below), whose sum is σ = 38338896837367. Its totient is φ = 9893891067856.

The previous prime is 19787799929087. The next prime is 19787799929113. The reversal of 19787799929104 is 40192999778791.

It is a happy number.

The square root of 19787799929104 is 4448348.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17237349 + ... + 18349435.

Almost surely, 2^{19787799929104} is an apocalyptic number.

19787799929104 is the 4448348-th square number.

It is an amenable number.

19787799929104 is a deficient number, since it is larger than the sum of its proper divisors (18551096908263).

19787799929104 is an frugal number, since it uses more digits than its factorization.

19787799929104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224182 (or 1112089 counting only the distinct ones).

The product of its (nonzero) digits is 1296243648, while the sum is 82.

The spelling of 19787799929104 in words is "nineteen trillion, seven hundred eighty-seven billion, seven hundred ninety-nine million, nine hundred twenty-nine thousand, one hundred four".