66653069872 has 60 divisors (see below), whose sum is σ = 138692661048. Its totient is φ = 30923737600.

The previous prime is 66653069863. The next prime is 66653069921. The reversal of 66653069872 is 27896035666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1346847 + ... + 1395457.

Almost surely, 2^66653069872 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 66653069872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69346330524).

66653069872 is an abundant number, since it is smaller than the sum of its proper divisors (72039591176).

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

66653069872 is a wasteful number, since it uses less digits than its factorization.

66653069872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48778 (or 48701 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 58.

The spelling of 66653069872 in words is "sixty-six billion, six hundred fifty-three million, sixty-nine thousand, eight hundred seventy-two".