66516008 has 16 divisors (see below), whose sum is σ = 134311380. Its totient is φ = 30699648.

The previous prime is 66515959. The next prime is 66516029. The reversal of 66516008 is 80061566.

It can be written as a sum of positive squares in 2 ways, for example, as 51008164 + 15507844 = 7142^2 + 3938^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319685 + ... + 319892.

Almost surely, 2^66516008 is an apocalyptic number.

It is an amenable number.

66516008 is an abundant number, since it is smaller than the sum of its proper divisors (67795372).

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

66516008 is a wasteful number, since it uses less digits than its factorization.

66516008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639596 (or 639592 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 66516008 is about 8155.7346695439. The cubic root of 66516008 is about 405.1744571779.

The spelling of 66516008 in words is "sixty-six million, five hundred sixteen thousand, eight".