665499999999 has 8 divisors (see below), whose sum is σ = 887699555712. Its totient is φ = 443483555480.

The previous prime is 665499999977. The next prime is 665500000037. The reversal of 665499999999 is 999999994566.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665499999999 is a prime.

665499999999 is a modest number, since divided by 999999 gives 665499 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665499999919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45769317 + ... + 45783854.

It is an arithmetic number, because the mean of its divisors is an integer number (110962444464).

Almost surely, 2^665499999999 is an apocalyptic number.

665499999999 is a deficient number, since it is larger than the sum of its proper divisors (222199555713).

665499999999 is a wasteful number, since it uses less digits than its factorization.

665499999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91555597.

The product of its digits is 30993639120, while the sum is 93.

The spelling of 665499999999 in words is "six hundred sixty-five billion, four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".