66144414 has 48 divisors (see below), whose sum is σ = 154975248. Its totient is φ = 18764928.

The previous prime is 66144391. The next prime is 66144427. The reversal of 66144414 is 41444166.

It is a congruent number.

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, 45442 + ... + 46874.

It is an arithmetic number, because the mean of its divisors is an integer number (3228651).

Almost surely, 2^66144414 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66144414, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77487624).

66144414 is an abundant number, since it is smaller than the sum of its proper divisors (88830834).

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

66144414 is a wasteful number, since it uses less digits than its factorization.

66144414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609 (or 1602 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 66144414 is about 8132.9216152623. The cubic root of 66144414 is about 404.4185406925.

The spelling of 66144414 in words is "sixty-six million, one hundred forty-four thousand, four hundred fourteen".