66231216 has 40 divisors (see below), whose sum is σ = 190109360. Its totient is φ = 22076928.

The previous prime is 66231161. The next prime is 66231229. The reversal of 66231216 is 61213266.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 66231216.

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, 76225 + ... + 77088.

It is an arithmetic number, because the mean of its divisors is an integer number (4752734).

Almost surely, 2^66231216 is an apocalyptic number.

It is an amenable number.

66231216 is an abundant number, since it is smaller than the sum of its proper divisors (123878144).

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

66231216 is a wasteful number, since it uses less digits than its factorization.

66231216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153330 (or 153318 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 66231216 is about 8138.2563242995. The cubic root of 66231216 is about 404.5953709104.

It can be divided in two parts, 662 and 31216, that added together give a triangular number (31878 = T₂₅₂).

The spelling of 66231216 in words is "sixty-six million, two hundred thirty-one thousand, two hundred sixteen".