66018641632 has 48 divisors (see below), whose sum is σ = 132281856000. Its totient is φ = 32427457920.

The previous prime is 66018641627. The next prime is 66018641639. The reversal of 66018641632 is 23614681066.

It is a happy number.

It is a super-2 number, since 2×66018641632² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66018641639) 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, 437457 + ... + 568687.

It is an arithmetic number, because the mean of its divisors is an integer number (2755872000).

Almost surely, 2^66018641632 is an apocalyptic number.

It is an amenable number.

66018641632 is an abundant number, since it is smaller than the sum of its proper divisors (66263214368).

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

66018641632 is a wasteful number, since it uses less digits than its factorization.

66018641632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131519 (or 131511 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 66018641632 in words is "sixty-six billion, eighteen million, six hundred forty-one thousand, six hundred thirty-two".