65605666 has 8 divisors (see below), whose sum is σ = 112466880. Its totient is φ = 28116708.

The previous prime is 65605621. The next prime is 65605667. The reversal of 65605666 is 66650656.

It is a happy number.

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

It is a super-2 number, since 2×65605666² = 8608206822607112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65605667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2343046 + ... + 2343073.

It is an arithmetic number, because the mean of its divisors is an integer number (14058360).

Almost surely, 2^65605666 is an apocalyptic number.

65605666 is a deficient number, since it is larger than the sum of its proper divisors (46861214).

65605666 is a wasteful number, since it uses less digits than its factorization.

65605666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4686128.

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

The square root of 65605666 is about 8099.7324647176. The cubic root of 65605666 is about 403.3175461495.

The spelling of 65605666 in words is "sixty-five million, six hundred five thousand, six hundred sixty-six".