16816818672 has 80 divisors (see below), whose sum is σ = 49061894560. Its totient is φ = 5513702400.

The previous prime is 16816818653. The next prime is 16816818703. The reversal of 16816818672 is 27681861861.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292729 + ... + 345432.

It is an arithmetic number, because the mean of its divisors is an integer number (613273682).

Almost surely, 2^16816818672 is an apocalyptic number.

16816818672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16816818672 is an abundant number, since it is smaller than the sum of its proper divisors (32245075888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16816818672 is a wasteful number, since it uses less digits than its factorization.

16816818672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638239 (or 638227 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The spelling of 16816818672 in words is "sixteen billion, eight hundred sixteen million, eight hundred eighteen thousand, six hundred seventy-two".