16691852518601 has 4 divisors (see below), whose sum is σ = 17975841173892. Its totient is φ = 15407863863312.

The previous prime is 16691852518597. The next prime is 16691852518667. The reversal of 16691852518601 is 10681525819661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5556957582400 + 11134894936201 = 2357320^2 + 3336899^2 .

It is a cyclic number.

It is not a de Polignac number, because 16691852518601 - 2² = 16691852518597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16691852515601) 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, 641994327626 + ... + 641994327651.

It is an arithmetic number, because the mean of its divisors is an integer number (4493960293473).

Almost surely, 2^{16691852518601} is an apocalyptic number.

It is an amenable number.

16691852518601 is a deficient number, since it is larger than the sum of its proper divisors (1283988655291).

16691852518601 is a wasteful number, since it uses less digits than its factorization.

16691852518601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283988655290.

The product of its (nonzero) digits is 6220800, while the sum is 59.

The spelling of 16691852518601 in words is "sixteen trillion, six hundred ninety-one billion, eight hundred fifty-two million, five hundred eighteen thousand, six hundred one".