65665066 has 8 divisors (see below), whose sum is σ = 98854020. Its totient is φ = 32713728.

The previous prime is 65665057. The next prime is 65665081. The reversal of 65665066 is 66056656.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 63920025 + 1745041 = 7995^2 + 1321^2 .

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

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, 58711 + ... + 59818.

Almost surely, 2^65665066 is an apocalyptic number.

65665066 is a deficient number, since it is larger than the sum of its proper divisors (33188954).

65665066 is a wasteful number, since it uses less digits than its factorization.

65665066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118808.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 65665066 is about 8103.3984228841. The cubic root of 65665066 is about 403.4392319582.

The spelling of 65665066 in words is "sixty-five million, six hundred sixty-five thousand, sixty-six".