16720475838871 has 4 divisors (see below), whose sum is σ = 19109115244432. Its totient is φ = 14331836433312.

The previous prime is 16720475838853. The next prime is 16720475838917. The reversal of 16720475838871 is 17883857402761.

16720475838871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16720475838871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16720475838797 and 16720475838806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720475838821) 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, 1194319702770 + ... + 1194319702783.

It is an arithmetic number, because the mean of its divisors is an integer number (4777278811108).

Almost surely, 2^{16720475838871} is an apocalyptic number.

16720475838871 is a deficient number, since it is larger than the sum of its proper divisors (2388639405561).

16720475838871 is an equidigital number, since it uses as much as digits as its factorization.

16720475838871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388639405560.

The product of its (nonzero) digits is 126443520, while the sum is 67.

The spelling of 16720475838871 in words is "sixteen trillion, seven hundred twenty billion, four hundred seventy-five million, eight hundred thirty-eight thousand, eight hundred seventy-one".