66471216 has 40 divisors (see below), whose sum is σ = 196249344. Its totient is φ = 18991680.

The previous prime is 66471193. The next prime is 66471217. The reversal of 66471216 is 61217466.

66471216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (66471217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98580 + ... + 99251.

Almost surely, 2^66471216 is an apocalyptic number.

It is an amenable number.

66471216 is an abundant number, since it is smaller than the sum of its proper divisors (129778128).

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

66471216 is a wasteful number, since it uses less digits than its factorization.

66471216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197849 (or 197843 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 66471216 is about 8152.9881638575. The cubic root of 66471216 is about 405.0834883514.

The spelling of 66471216 in words is "sixty-six million, four hundred seventy-one thousand, two hundred sixteen".