216434168820 has 72 divisors (see below), whose sum is σ = 657683391456. Its totient is φ = 57613236672.

The previous prime is 216434168813. The next prime is 216434168857. The reversal of 216434168820 is 28861434612.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 966522 + ... + 1169201.

It is an arithmetic number, because the mean of its divisors is an integer number (9134491548).

Almost surely, 2^216434168820 is an apocalyptic number.

216434168820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216434168820 is an abundant number, since it is smaller than the sum of its proper divisors (441249222636).

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

216434168820 is a wasteful number, since it uses less digits than its factorization.

216434168820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136301 (or 2136296 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 216434168820 in words is "two hundred sixteen billion, four hundred thirty-four million, one hundred sixty-eight thousand, eight hundred twenty".