216840645735810 has 32 divisors (see below), whose sum is σ = 520418755308672. Its totient is φ = 57824038247040.

The previous prime is 216840645735803. The next prime is 216840645735859. The reversal of 216840645735810 is 18537546048612.

It is a super-2 number, since 2×216840645735810² (a number of 29 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 5152822 + ... + 21453038.

It is an arithmetic number, because the mean of its divisors is an integer number (16263086103396).

Almost surely, 2^{216840645735810} is an apocalyptic number.

216840645735810 is an abundant number, since it is smaller than the sum of its proper divisors (303578109572862).

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

216840645735810 is a wasteful number, since it uses less digits than its factorization.

216840645735810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16743658.

The product of its (nonzero) digits is 38707200, while the sum is 60.

The spelling of 216840645735810 in words is "two hundred sixteen trillion, eight hundred forty billion, six hundred forty-five million, seven hundred thirty-five thousand, eight hundred ten".