66707044440 has 128 divisors (see below), whose sum is σ = 212762557440. Its totient is φ = 16694053376.

The previous prime is 66707044429. The next prime is 66707044457. The reversal of 66707044440 is 4444070766.

It is a junction number, because it is equal to n+sod(n) for n = 66707044392 and 66707044401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81732 + ... + 374291.

It is an arithmetic number, because the mean of its divisors is an integer number (1662207480).

Almost surely, 2^66707044440 is an apocalyptic number.

66707044440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66707044440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106381278720).

66707044440 is an abundant number, since it is smaller than the sum of its proper divisors (146055513000).

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

66707044440 is a wasteful number, since it uses less digits than its factorization.

66707044440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456113 (or 456109 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 42.

The spelling of 66707044440 in words is "sixty-six billion, seven hundred seven million, forty-four thousand, four hundred forty".