65616666 has 8 divisors (see below), whose sum is σ = 131233344. Its totient is φ = 21872220.

The previous prime is 65616643. The next prime is 65616679. The reversal of 65616666 is 66661656.

It is a sphenic number, since it is the product of 3 distinct primes.

65616666 is an admirable number.

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, 5468050 + ... + 5468061.

It is an arithmetic number, because the mean of its divisors is an integer number (16404168).

Almost surely, 2^65616666 is an apocalyptic number.

65616666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

65616666 is a wasteful number, since it uses less digits than its factorization.

65616666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10936116.

The product of its digits is 233280, while the sum is 42.

The square root of 65616666 is about 8100.4114710303. The cubic root of 65616666 is about 403.3400860984.

The spelling of 65616666 in words is "sixty-five million, six hundred sixteen thousand, six hundred sixty-six".