216543903351654 has 32 divisors (see below), whose sum is σ = 434838831729120. Its totient is φ = 71889866986752.

The previous prime is 216543903351583. The next prime is 216543903351707. The reversal of 216543903351654 is 456153309345612.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216543903351594 and 216543903351603.

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, 48273649 + ... + 52568364.

It is an arithmetic number, because the mean of its divisors is an integer number (13588713491535).

Almost surely, 2^{216543903351654} is an apocalyptic number.

216543903351654 is an abundant number, since it is smaller than the sum of its proper divisors (218294928377466).

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

216543903351654 is a wasteful number, since it uses less digits than its factorization.

216543903351654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100843464.

The product of its (nonzero) digits is 34992000, while the sum is 57.

The spelling of 216543903351654 in words is "two hundred sixteen trillion, five hundred forty-three billion, nine hundred three million, three hundred fifty-one thousand, six hundred fifty-four".