66541696 has 32 divisors (see below), whose sum is σ = 142764300. Its totient is φ = 30710784.

The previous prime is 66541693. The next prime is 66541703. The reversal of 66541696 is 69614566.

66541696 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 57153600 + 9388096 = 7560^2 + 3064^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (66541693) 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 3 ways as a sum of consecutive naturals, for example, 18331 + ... + 21658.

Almost surely, 2^66541696 is an apocalyptic number.

It is an amenable number.

66541696 is an abundant number, since it is smaller than the sum of its proper divisors (76222604).

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

66541696 is a wasteful number, since it uses less digits than its factorization.

66541696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40016 (or 40004 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The square root of 66541696 is about 8157.3093603222. The cubic root of 66541696 is about 405.2266089441.

The spelling of 66541696 in words is "sixty-six million, five hundred forty-one thousand, six hundred ninety-six".