66411968 has 56 divisors (see below), whose sum is σ = 153509472. Its totient is φ = 27915264.

The previous prime is 66411967. The next prime is 66411991. The reversal of 66411968 is 86911466.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66411967) 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, 22346 + ... + 25142.

Almost surely, 2^66411968 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 66411968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76754736).

66411968 is an abundant number, since it is smaller than the sum of its proper divisors (87097504).

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

66411968 is a wasteful number, since it uses less digits than its factorization.

66411968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2869 (or 2859 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 66411968 is about 8149.3538394157. The cubic root of 66411968 is about 404.9630977910.

The spelling of 66411968 in words is "sixty-six million, four hundred eleven thousand, nine hundred sixty-eight".