665199898 has 8 divisors (see below), whose sum is σ = 1088508960. Its totient is φ = 302363580.

The previous prime is 665199893. The next prime is 665199943. The reversal of 665199898 is 898991566.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (665199893) 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, 15118158 + ... + 15118201.

It is an arithmetic number, because the mean of its divisors is an integer number (136063620).

Almost surely, 2^665199898 is an apocalyptic number.

665199898 is a deficient number, since it is larger than the sum of its proper divisors (423309062).

665199898 is a wasteful number, since it uses less digits than its factorization.

665199898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30236372.

The product of its digits is 8398080, while the sum is 61.

The square root of 665199898 is about 25791.4694812064. The cubic root of 665199898 is about 872.9393240769.

The spelling of 665199898 in words is "six hundred sixty-five million, one hundred ninety-nine thousand, eight hundred ninety-eight".