66546216 has 96 divisors (see below), whose sum is σ = 199480320. Its totient is φ = 19872000.

The previous prime is 66546187. The next prime is 66546223. The reversal of 66546216 is 61264566.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57241 + ... + 58391.

It is an arithmetic number, because the mean of its divisors is an integer number (2077920).

Almost surely, 2^66546216 is an apocalyptic number.

66546216 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66546216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99740160).

66546216 is an abundant number, since it is smaller than the sum of its proper divisors (132934104).

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

66546216 is a wasteful number, since it uses less digits than its factorization.

66546216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247 (or 1240 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 66546216 is about 8157.5864077557. The cubic root of 66546216 is about 405.2357840574.

The spelling of 66546216 in words is "sixty-six million, five hundred forty-six thousand, two hundred sixteen".