66404144 has 10 divisors (see below), whose sum is σ = 128658060. Its totient is φ = 33202064.

The previous prime is 66404141. The next prime is 66404189. The reversal of 66404144 is 44140466.

It is not an unprimeable number, because it can be changed into a prime (66404141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2075114 + ... + 2075145.

It is an arithmetic number, because the mean of its divisors is an integer number (12865806).

Almost surely, 2^66404144 is an apocalyptic number.

It is an amenable number.

66404144 is a deficient number, since it is larger than the sum of its proper divisors (62253916).

66404144 is a wasteful number, since it uses less digits than its factorization.

66404144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150267 (or 4150261 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 66404144 is about 8148.8737872175. The cubic root of 66404144 is about 404.9471942533.

The spelling of 66404144 in words is "sixty-six million, four hundred four thousand, one hundred forty-four".