16718218881 has 32 divisors (see below), whose sum is σ = 27810881280. Its totient is φ = 8697590784.

The previous prime is 16718218877. The next prime is 16718218889. The reversal of 16718218881 is 18881281761.

It is not a de Polignac number, because 16718218881 - 2² = 16718218877 is a prime.

It is a super-2 number, since 2×16718218881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16718218889) 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, 399516 + ... + 439373.

It is an arithmetic number, because the mean of its divisors is an integer number (869090040).

Almost surely, 2^16718218881 is an apocalyptic number.

It is an amenable number.

16718218881 is a deficient number, since it is larger than the sum of its proper divisors (11092662399).

16718218881 is a wasteful number, since it uses less digits than its factorization.

16718218881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838985.

The product of its digits is 344064, while the sum is 51.

The spelling of 16718218881 in words is "sixteen billion, seven hundred eighteen million, two hundred eighteen thousand, eight hundred eighty-one".