665999452618 has 4 divisors (see below), whose sum is σ = 998999178930. Its totient is φ = 332999726308.

The previous prime is 665999452583. The next prime is 665999452631. The reversal of 665999452618 is 816254999566.

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

It can be written as a sum of positive squares in only one way, i.e., 650259993769 + 15739458849 = 806387^2 + 125457^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 166499863153 + ... + 166499863156.

Almost surely, 2^665999452618 is an apocalyptic number.

665999452618 is a deficient number, since it is larger than the sum of its proper divisors (332999726312).

665999452618 is a wasteful number, since it uses less digits than its factorization.

665999452618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332999726311.

The product of its digits is 251942400, while the sum is 70.

The spelling of 665999452618 in words is "six hundred sixty-five billion, nine hundred ninety-nine million, four hundred fifty-two thousand, six hundred eighteen".