19713073736 has 8 divisors (see below), whose sum is σ = 36962013270. Its totient is φ = 9856536864.

The previous prime is 19713073733. The next prime is 19713073799. The reversal of 19713073736 is 63737031791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17915822500 + 1797251236 = 133850^2 + 42394^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×19713073736² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19713073733) 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 as a sum of consecutive naturals, namely, 1232067101 + ... + 1232067116.

Almost surely, 2^19713073736 is an apocalyptic number.

It is an amenable number.

19713073736 is a deficient number, since it is larger than the sum of its proper divisors (17248939534).

19713073736 is a wasteful number, since it uses less digits than its factorization.

19713073736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464134223 (or 2464134219 counting only the distinct ones).

The product of its (nonzero) digits is 500094, while the sum is 47.

The spelling of 19713073736 in words is "nineteen billion, seven hundred thirteen million, seventy-three thousand, seven hundred thirty-six".