66386613552 has 120 divisors (see below), whose sum is σ = 199585279296. Its totient is φ = 18959359104.

The previous prime is 66386613551. The next prime is 66386613571. The reversal of 66386613552 is 25531668366.

It is a junction number, because it is equal to n+sod(n) for n = 66386613495 and 66386613504.

It is not an unprimeable number, because it can be changed into a prime (66386613551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7208983 + ... + 7218185.

Almost surely, 2^66386613552 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 66386613552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99792639648).

66386613552 is an abundant number, since it is smaller than the sum of its proper divisors (133198665744).

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

66386613552 is a wasteful number, since it uses less digits than its factorization.

66386613552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12295 (or 12282 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 51.

The spelling of 66386613552 in words is "sixty-six billion, three hundred eighty-six million, six hundred thirteen thousand, five hundred fifty-two".