66518016 has 88 divisors (see below), whose sum is σ = 180791040. Its totient is φ = 21737472.

The previous prime is 66518009. The next prime is 66518057. The reversal of 66518016 is 61081566.

It is a congruent number.

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, 181065 + ... + 181431.

Almost surely, 2^66518016 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 66518016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90395520).

66518016 is an abundant number, since it is smaller than the sum of its proper divisors (114273024).

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

66518016 is a wasteful number, since it uses less digits than its factorization.

66518016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 66518016 is about 8155.8577721782. The cubic root of 66518016 is about 405.1785343023.

It can be divided in two parts, 665 and 18016, that added together give a palindrome (18681).

The spelling of 66518016 in words is "sixty-six million, five hundred eighteen thousand, sixteen".