66040506 has 48 divisors (see below), whose sum is σ = 164818368. Its totient is φ = 18720000.

The previous prime is 66040489. The next prime is 66040517. The reversal of 66040506 is 60504066.

66040506 is a `hidden beast` number, since 6 + 604 + 0 + 50 + 6 = 666.

It is a super-2 number, since 2×66040506² = 8722696865472072, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66040506.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14506 + ... + 18506.

It is an arithmetic number, because the mean of its divisors is an integer number (3433716).

Almost surely, 2^66040506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66040506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82409184).

66040506 is an abundant number, since it is smaller than the sum of its proper divisors (98777862).

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

66040506 is a wasteful number, since it uses less digits than its factorization.

66040506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4147 (or 4144 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 66040506 is about 8126.5309942189. The cubic root of 66040506 is about 404.2066591288.

The spelling of 66040506 in words is "sixty-six million, forty thousand, five hundred six".