16718388857 has 32 divisors (see below), whose sum is σ = 18130560000. Its totient is φ = 15368097600.

The previous prime is 16718388853. The next prime is 16718388887. The reversal of 16718388857 is 75888381761.

It is a cyclic number.

It is not a de Polignac number, because 16718388857 - 2² = 16718388853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16718388857.

It is not an unprimeable number, because it can be changed into a prime (16718388851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47903519 + ... + 47903867.

It is an arithmetic number, because the mean of its divisors is an integer number (566580000).

Almost surely, 2^16718388857 is an apocalyptic number.

It is an amenable number.

16718388857 is a deficient number, since it is larger than the sum of its proper divisors (1412171143).

16718388857 is a wasteful number, since it uses less digits than its factorization.

16718388857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861.

The product of its digits is 18063360, while the sum is 62.

The spelling of 16718388857 in words is "sixteen billion, seven hundred eighteen million, three hundred eighty-eight thousand, eight hundred fifty-seven".