172218805930 has 64 divisors (see below), whose sum is σ = 320367218688. Its totient is φ = 66616542720.

The previous prime is 172218805909. The next prime is 172218805937. The reversal of 172218805930 is 39508812271.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (172218805937) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28448784 + ... + 28454836.

It is an arithmetic number, because the mean of its divisors is an integer number (5005737792).

Almost surely, 2^172218805930 is an apocalyptic number.

172218805930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172218805930 is a deficient number, since it is larger than the sum of its proper divisors (148148412758).

172218805930 is a wasteful number, since it uses less digits than its factorization.

172218805930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6751.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 172218805930 in words is "one hundred seventy-two billion, two hundred eighteen million, eight hundred five thousand, nine hundred thirty".