66313856 has 96 divisors (see below), whose sum is σ = 156687300. Its totient is φ = 27869184.

The previous prime is 66313837. The next prime is 66313861. The reversal of 66313856 is 65831366.

It can be written as a sum of positive squares in 2 ways, for example, as 65934400 + 379456 = 8120^2 + 616^2 .

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, 608330 + ... + 608438.

Almost surely, 2^66313856 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 66313856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78343650).

66313856 is an abundant number, since it is smaller than the sum of its proper divisors (90373444).

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

66313856 is a wasteful number, since it uses less digits than its factorization.

66313856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 215 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 66313856 is about 8143.3319961795. The cubic root of 66313856 is about 404.7635789278.

The spelling of 66313856 in words is "sixty-six million, three hundred thirteen thousand, eight hundred fifty-six".