16718667787945 has 8 divisors (see below), whose sum is σ = 20063436620040. Its totient is φ = 13374244047360.

The previous prime is 16718667787919. The next prime is 16718667788029. The reversal of 16718667787945 is 54978776681761.

It is a happy number.

16718667787945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6379221106944 + 10339446681001 = 2525712^2 + 3215501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16718667787945 - 2¹⁹ = 16718667263657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86166280 + ... + 86360089.

It is an arithmetic number, because the mean of its divisors is an integer number (2507929577505).

Almost surely, 2^{16718667787945} is an apocalyptic number.

It is an amenable number.

16718667787945 is a deficient number, since it is larger than the sum of its proper divisors (3344768832095).

16718667787945 is a wasteful number, since it uses less digits than its factorization.

16718667787945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172545755.

The product of its digits is 5974456320, while the sum is 82.

The spelling of 16718667787945 in words is "sixteen trillion, seven hundred eighteen billion, six hundred sixty-seven million, seven hundred eighty-seven thousand, nine hundred forty-five".