66356440 has 32 divisors (see below), whose sum is σ = 158086080. Its totient is φ = 24980992.

The previous prime is 66356419. The next prime is 66356443. The reversal of 66356440 is 4465366.

66356440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 66356396 and 66356405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66356443) 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, 48112 + ... + 49471.

It is an arithmetic number, because the mean of its divisors is an integer number (4940190).

Almost surely, 2^66356440 is an apocalyptic number.

It is an amenable number.

66356440 is an abundant number, since it is smaller than the sum of its proper divisors (91729640).

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

66356440 is a wasteful number, since it uses less digits than its factorization.

66356440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97611 (or 97607 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 66356440 is about 8145.9462311017. The cubic root of 66356440 is about 404.8502011668.

The spelling of 66356440 in words is "sixty-six million, three hundred fifty-six thousand, four hundred forty".