66378885071 has 8 divisors (see below), whose sum is σ = 66743922960. Its totient is φ = 66014065152.

The previous prime is 66378885061. The next prime is 66378885101. The reversal of 66378885071 is 17058887366.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66378885071 - 2⁶ = 66378885007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66378885071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66378885061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576221 + ... + 681753.

It is an arithmetic number, because the mean of its divisors is an integer number (8342990370).

Almost surely, 2^66378885071 is an apocalyptic number.

66378885071 is a deficient number, since it is larger than the sum of its proper divisors (365037889).

66378885071 is a wasteful number, since it uses less digits than its factorization.

66378885071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108985.

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 66378885071 in words is "sixty-six billion, three hundred seventy-eight million, eight hundred eighty-five thousand, seventy-one".