19949688723744 has 72 divisors (see below), whose sum is σ = 61095921727932. Its totient is φ = 6138365760000.

The previous prime is 19949688723719. The next prime is 19949688723781. The reversal of 19949688723744 is 44732788694991.

19949688723744 is a `hidden beast` number, since 1 + 9 + 9 + 496 + 8 + 87 + 2 + 3 + 7 + 44 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16553408313744 + 3396280410000 = 4068588^2 + 1842900^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2664217507 + ... + 2664224994.

Almost surely, 2^{19949688723744} is an apocalyptic number.

It is an amenable number.

19949688723744 is an abundant number, since it is smaller than the sum of its proper divisors (41146233004188).

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

19949688723744 is a wasteful number, since it uses less digits than its factorization.

19949688723744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5328442530 (or 5328442519 counting only the distinct ones).

The product of its digits is 5267275776, while the sum is 81.

The spelling of 19949688723744 in words is "nineteen trillion, nine hundred forty-nine billion, six hundred eighty-eight million, seven hundred twenty-three thousand, seven hundred forty-four".