65198666 has 8 divisors (see below), whose sum is σ = 105320964. Its totient is φ = 30091680.

The previous prime is 65198659. The next prime is 65198669. The reversal of 65198666 is 66689156.

It can be written as a sum of positive squares in 2 ways, for example, as 64240225 + 958441 = 8015^2 + 979^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 65198666.

It is not an unprimeable number, because it can be changed into a prime (65198669) 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, 1253795 + ... + 1253846.

Almost surely, 2^65198666 is an apocalyptic number.

65198666 is a deficient number, since it is larger than the sum of its proper divisors (40122298).

65198666 is a wasteful number, since it uses less digits than its factorization.

65198666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507656.

The product of its digits is 466560, while the sum is 47.

The square root of 65198666 is about 8074.5690906698. The cubic root of 65198666 is about 402.4817907738.

The spelling of 65198666 in words is "sixty-five million, one hundred ninety-eight thousand, six hundred sixty-six".