66911768 has 64 divisors (see below), whose sum is σ = 164678400. Its totient is φ = 24693120.

The previous prime is 66911753. The next prime is 66911771. The reversal of 66911768 is 86711966.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a zygodrome in base 2.

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, 8846 + ... + 14562.

It is an arithmetic number, because the mean of its divisors is an integer number (2573100).

Almost surely, 2^66911768 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 66911768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82339200).

66911768 is an abundant number, since it is smaller than the sum of its proper divisors (97766632).

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

66911768 is a wasteful number, since it uses less digits than its factorization.

66911768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5760 (or 5756 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 66911768 is about 8179.9613691019. The cubic root of 66911768 is about 405.9764439082.

The spelling of 66911768 in words is "sixty-six million, nine hundred eleven thousand, seven hundred sixty-eight".