66258816 has 96 divisors (see below), whose sum is σ = 190766520. Its totient is φ = 20367360.

The previous prime is 66258781. The next prime is 66258839. The reversal of 66258816 is 61885266.

It is a tau number, because it is divible by the number of its divisors (96).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64386 + ... + 65406.

Almost surely, 2^66258816 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 66258816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95383260).

66258816 is an abundant number, since it is smaller than the sum of its proper divisors (124507704).

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

66258816 is a wasteful number, since it uses less digits than its factorization.

66258816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1039 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 66258816 is about 8139.9518426094. The cubic root of 66258816 is about 404.6515643597.

The spelling of 66258816 in words is "sixty-six million, two hundred fifty-eight thousand, eight hundred sixteen".