66642363888 has 80 divisors (see below), whose sum is σ = 176246564736. Its totient is φ = 21687240960.

The previous prime is 66642363841. The next prime is 66642363899. The reversal of 66642363888 is 88836324666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5217606 + ... + 5230362.

Almost surely, 2^66642363888 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 66642363888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88123282368).

66642363888 is an abundant number, since it is smaller than the sum of its proper divisors (109604200848).

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

66642363888 is a wasteful number, since it uses less digits than its factorization.

66642363888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15342 (or 15336 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 60.

The spelling of 66642363888 in words is "sixty-six billion, six hundred forty-two million, three hundred sixty-three thousand, eight hundred eighty-eight".