66728385592 has 64 divisors (see below), whose sum is σ = 137736950400. Its totient is φ = 30054810240.

The previous prime is 66728385587. The next prime is 66728385613. The reversal of 66728385592 is 29558382766.

It is a happy number.

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66728385592.

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, 6685918 + ... + 6695890.

It is an arithmetic number, because the mean of its divisors is an integer number (2152139850).

Almost surely, 2^66728385592 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 66728385592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68868475200).

66728385592 is an abundant number, since it is smaller than the sum of its proper divisors (71008564808).

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

66728385592 is a wasteful number, since it uses less digits than its factorization.

66728385592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10676 (or 10672 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 61.

The spelling of 66728385592 in words is "sixty-six billion, seven hundred twenty-eight million, three hundred eighty-five thousand, five hundred ninety-two".