66455860 has 12 divisors (see below), whose sum is σ = 139557348. Its totient is φ = 26582336.

The previous prime is 66455843. The next prime is 66455867. The reversal of 66455860 is 6855466.

66455860 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 35497764 + 30958096 = 5958^2 + 5564^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66455867) 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, 1661377 + ... + 1661416.

It is an arithmetic number, because the mean of its divisors is an integer number (11629779).

Almost surely, 2^66455860 is an apocalyptic number.

It is an amenable number.

66455860 is an abundant number, since it is smaller than the sum of its proper divisors (73101488).

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

66455860 is a wasteful number, since it uses less digits than its factorization.

66455860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322802 (or 3322800 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 66455860 is about 8152.0463688573. The cubic root of 66455860 is about 405.0522921861.

The spelling of 66455860 in words is "sixty-six million, four hundred fifty-five thousand, eight hundred sixty".