66911760 has 120 divisors (see below), whose sum is σ = 226324800. Its totient is φ = 17715456.

The previous prime is 66911753. The next prime is 66911771. The reversal of 66911760 is 6711966.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143047 + ... + 143513.

It is an arithmetic number, because the mean of its divisors is an integer number (1886040).

Almost surely, 2^66911760 is an apocalyptic number.

66911760 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 66911760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113162400).

66911760 is an abundant number, since it is smaller than the sum of its proper divisors (159413040).

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

66911760 is a wasteful number, since it uses less digits than its factorization.

66911760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 66911760 is about 8179.9608801021. The cubic root of 66911760 is about 405.9764277286.

The spelling of 66911760 in words is "sixty-six million, nine hundred eleven thousand, seven hundred sixty".