216644723305400 has 48 divisors (see below), whose sum is σ = 542445057205800. Its totient is φ = 79991897834880.

The previous prime is 216644723305399. The next prime is 216644723305427. The reversal of 216644723305400 is 4503327446612.

It is a super-2 number, since 2×216644723305400² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41662444190 + ... + 41662449389.

Almost surely, 2^{216644723305400} is an apocalyptic number.

216644723305400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216644723305400 is an abundant number, since it is smaller than the sum of its proper divisors (325800333900400).

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

216644723305400 is a wasteful number, since it uses less digits than its factorization.

216644723305400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83324893608 (or 83324893599 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 47.

The spelling of 216644723305400 in words is "two hundred sixteen trillion, six hundred forty-four billion, seven hundred twenty-three million, three hundred five thousand, four hundred".