66450816 has 96 divisors (see below), whose sum is σ = 196513200. Its totient is φ = 21537792.

The previous prime is 66450799. The next prime is 66450821. The reversal of 66450816 is 61805466.

66450816 is a `hidden beast` number, since 6 + 645 + 0 + 8 + 1 + 6 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 41845 + ... + 43403.

Almost surely, 2^66450816 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 66450816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98256600).

66450816 is an abundant number, since it is smaller than the sum of its proper divisors (130062384).

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

66450816 is a wasteful number, since it uses less digits than its factorization.

66450816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616 (or 1601 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 66450816 is about 8151.7369928132. The cubic root of 66450816 is about 405.0420441034.

The spelling of 66450816 in words is "sixty-six million, four hundred fifty thousand, eight hundred sixteen".