163218220618220 has 24 divisors (see below), whose sum is σ = 350050992306624. Its totient is φ = 63898197007616.

The previous prime is 163218220618153. The next prime is 163218220618247. The reversal of 163218220618220 is 22816022812361.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86818201517 + ... + 86818203396.

It is an arithmetic number, because the mean of its divisors is an integer number (14585458012776).

Almost surely, 2^{163218220618220} is an apocalyptic number.

163218220618220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163218220618220 is an abundant number, since it is smaller than the sum of its proper divisors (186832771688404).

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

163218220618220 is a wasteful number, since it uses less digits than its factorization.

163218220618220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173636404969 (or 173636404967 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 163218220618220 in words is "one hundred sixty-three trillion, two hundred eighteen billion, two hundred twenty million, six hundred eighteen thousand, two hundred twenty".