66147136242 has 128 divisors (see below), whose sum is σ = 150842926080. Its totient is φ = 19162967040.

The previous prime is 66147136217. The next prime is 66147136261. The reversal of 66147136242 is 24263174166.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66147136194 and 66147136203.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28796038 + ... + 28798334.

It is an arithmetic number, because the mean of its divisors is an integer number (1178460360).

Almost surely, 2^66147136242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66147136242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75421463040).

66147136242 is an abundant number, since it is smaller than the sum of its proper divisors (84695789838).

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

66147136242 is a wasteful number, since it uses less digits than its factorization.

66147136242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568.

The product of its digits is 290304, while the sum is 42.

The spelling of 66147136242 in words is "sixty-six billion, one hundred forty-seven million, one hundred thirty-six thousand, two hundred forty-two".