66147144640 has 112 divisors (see below), whose sum is σ = 158659372800. Its totient is φ = 26267000832.

The previous prime is 66147144611. The next prime is 66147144671. The reversal of 66147144640 is 4644174166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29970417 + ... + 29972623.

Almost surely, 2^66147144640 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 66147144640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79329686400).

66147144640 is an abundant number, since it is smaller than the sum of its proper divisors (92512228160).

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

66147144640 is a wasteful number, since it uses less digits than its factorization.

66147144640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2862 (or 2852 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 43.

The spelling of 66147144640 in words is "sixty-six billion, one hundred forty-seven million, one hundred forty-four thousand, six hundred forty".