331816221818 has 8 divisors (see below), whose sum is σ = 497773745280. Its totient is φ = 165891640060.

The previous prime is 331816221817. The next prime is 331816221857. The reversal of 331816221818 is 818122618133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×331816221818² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (331816221817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8210228 + ... + 8250543.

It is an arithmetic number, because the mean of its divisors is an integer number (62221718160).

Almost surely, 2^331816221818 is an apocalyptic number.

331816221818 is a deficient number, since it is larger than the sum of its proper divisors (165957523462).

331816221818 is a wasteful number, since it uses less digits than its factorization.

331816221818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16470852.

The product of its digits is 110592, while the sum is 44.

The spelling of 331816221818 in words is "three hundred thirty-one billion, eight hundred sixteen million, two hundred twenty-one thousand, eight hundred eighteen".