66660144 has 40 divisors (see below), whose sum is σ = 173828160. Its totient is φ = 22010688.

The previous prime is 66660131. The next prime is 66660161. The reversal of 66660144 is 44106666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1354 + ... + 11625.

It is an arithmetic number, because the mean of its divisors is an integer number (4345704).

Almost surely, 2^66660144 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 66660144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86914080).

66660144 is an abundant number, since it is smaller than the sum of its proper divisors (107168016).

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

66660144 is a wasteful number, since it uses less digits than its factorization.

66660144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13097 (or 13091 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 66660144 is about 8164.5663693793. The cubic root of 66660144 is about 405.4669085482.

The spelling of 66660144 in words is "sixty-six million, six hundred sixty thousand, one hundred forty-four".