66441380408 has 64 divisors (see below), whose sum is σ = 139674514560. Its totient is φ = 29427618816.

The previous prime is 66441380353. The next prime is 66441380413. The reversal of 66441380408 is 80408314466.

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, 162641 + ... + 399167.

It is an arithmetic number, because the mean of its divisors is an integer number (2182414290).

Almost surely, 2^66441380408 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 66441380408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69837257280).

66441380408 is an abundant number, since it is smaller than the sum of its proper divisors (73233134152).

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

66441380408 is a wasteful number, since it uses less digits than its factorization.

66441380408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236656 (or 236652 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 44.

The spelling of 66441380408 in words is "sixty-six billion, four hundred forty-one million, three hundred eighty thousand, four hundred eight".