665499511 has 8 divisors (see below), whose sum is σ = 689280480. Its totient is φ = 641774112.

The previous prime is 665499487. The next prime is 665499559. The reversal of 665499511 is 115994566.

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 not a de Polignac number, because 665499511 - 2⁵ = 665499479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665499011) 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, 11286 + ... + 38188.

It is an arithmetic number, because the mean of its divisors is an integer number (86160060).

Almost surely, 2^665499511 is an apocalyptic number.

665499511 is a deficient number, since it is larger than the sum of its proper divisors (23780969).

665499511 is a wasteful number, since it uses less digits than its factorization.

665499511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27785.

The product of its digits is 291600, while the sum is 46.

The square root of 665499511 is about 25797.2772012862. The cubic root of 665499511 is about 873.0703647425.

The spelling of 665499511 in words is "six hundred sixty-five million, four hundred ninety-nine thousand, five hundred eleven".