66119440 has 20 divisors (see below), whose sum is σ = 153727884. Its totient is φ = 26447744.

The previous prime is 66119437. The next prime is 66119441. The reversal of 66119440 is 4491166.

66119440 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 49112064 + 17007376 = 7008^2 + 4124^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (66119441) 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, 413167 + ... + 413326.

Almost surely, 2^66119440 is an apocalyptic number.

It is an amenable number.

66119440 is an abundant number, since it is smaller than the sum of its proper divisors (87608444).

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

66119440 is a wasteful number, since it uses less digits than its factorization.

66119440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826506 (or 826500 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 66119440 is about 8131.3861057018. The cubic root of 66119440 is about 404.3676358142.

The spelling of 66119440 in words is "sixty-six million, one hundred nineteen thousand, four hundred forty".