66581413000 has 32 divisors (see below), whose sum is σ = 155800508760. Its totient is φ = 26632564800.

The previous prime is 66581412983. The next prime is 66581413001. The reversal of 66581413000 is 31418566.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23625534436 + 42955878564 = 153706^2 + 207258^2 .

It is not an unprimeable number, because it can be changed into a prime (66581413001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33289707 + ... + 33291706.

Almost surely, 2^66581413000 is an apocalyptic number.

It is an amenable number.

66581413000 is an abundant number, since it is smaller than the sum of its proper divisors (89219095760).

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

66581413000 is a wasteful number, since it uses less digits than its factorization.

66581413000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66581434 (or 66581420 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 66581413000 in words is "sixty-six billion, five hundred eighty-one million, four hundred thirteen thousand".