19709504721768 has 16 divisors (see below), whose sum is σ = 49273761804480. Its totient is φ = 6569834907248.

The previous prime is 19709504721761. The next prime is 19709504721779. The reversal of 19709504721768 is 86712740590791.

It is a super-3 number, since 3×19709504721768³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19709504721699 and 19709504721708.

It is not an unprimeable number, because it can be changed into a prime (19709504721761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410614681680 + ... + 410614681727.

It is an arithmetic number, because the mean of its divisors is an integer number (3079610112780).

Almost surely, 2^{19709504721768} is an apocalyptic number.

It is an amenable number.

19709504721768 is an abundant number, since it is smaller than the sum of its proper divisors (29564257082712).

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

19709504721768 is a wasteful number, since it uses less digits than its factorization.

19709504721768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821229363416 (or 821229363412 counting only the distinct ones).

The product of its (nonzero) digits is 53343360, while the sum is 66.

The spelling of 19709504721768 in words is "nineteen trillion, seven hundred nine billion, five hundred four million, seven hundred twenty-one thousand, seven hundred sixty-eight".