665556299 has 4 divisors (see below), whose sum is σ = 676467120. Its totient is φ = 654645480.

The previous prime is 665556271. The next prime is 665556361. The reversal of 665556299 is 992655566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665556299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665556299.

It is not an unprimeable number, because it can be changed into a prime (665556599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5455319 + ... + 5455440.

It is an arithmetic number, because the mean of its divisors is an integer number (169116780).

Almost surely, 2^665556299 is an apocalyptic number.

665556299 is a deficient number, since it is larger than the sum of its proper divisors (10910821).

665556299 is a wasteful number, since it uses less digits than its factorization.

665556299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10910820.

The product of its digits is 4374000, while the sum is 53.

The square root of 665556299 is about 25798.3778366005. The cubic root of 665556299 is about 873.0951974728.

The spelling of 665556299 in words is "six hundred sixty-five million, five hundred fifty-six thousand, two hundred ninety-nine".