16816484781 has 12 divisors (see below), whose sum is σ = 25074042240. Its totient is φ = 10849344840.

The previous prime is 16816484777. The next prime is 16816484809. The reversal of 16816484781 is 18748461861.

16816484781 is a `hidden beast` number, since 1 + 6 + 8 + 164 + 8 + 478 + 1 = 666.

It is not a de Polignac number, because 16816484781 - 2² = 16816484777 is a prime.

It is a super-2 number, since 2×16816484781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16816484731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30136791 + ... + 30137348.

It is an arithmetic number, because the mean of its divisors is an integer number (2089503520).

Almost surely, 2^16816484781 is an apocalyptic number.

It is an amenable number.

16816484781 is a deficient number, since it is larger than the sum of its proper divisors (8257557459).

16816484781 is a wasteful number, since it uses less digits than its factorization.

16816484781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60274176 (or 60274173 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The spelling of 16816484781 in words is "sixteen billion, eight hundred sixteen million, four hundred eighty-four thousand, seven hundred eighty-one".