66455205040 has 80 divisors (see below), whose sum is σ = 176904605952. Its totient is φ = 22742883072.

The previous prime is 66455205031. The next prime is 66455205041. The reversal of 66455205040 is 4050255466.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (66455205041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197847 + ... + 414793.

Almost surely, 2^66455205040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66455205040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88452302976).

66455205040 is an abundant number, since it is smaller than the sum of its proper divisors (110449400912).

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

66455205040 is a wasteful number, since it uses less digits than its factorization.

66455205040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217514 (or 217508 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 66455205040 in words is "sixty-six billion, four hundred fifty-five million, two hundred five thousand, forty".