499987665 has 24 divisors (see below), whose sum is σ = 872981928. Its totient is φ = 264710400.

The previous prime is 499987643. The next prime is 499987669. The reversal of 499987665 is 566789994.

It is a happy number.

499987665 is a `hidden beast` number, since 499 + 9 + 87 + 6 + 65 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 113039424 + 386948241 = 10632^2 + 19671^2 .

It is not a de Polignac number, because 499987665 - 2¹¹ = 499985617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (499987669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34386 + ... + 46715.

It is an arithmetic number, because the mean of its divisors is an integer number (36374247).

Almost surely, 2^499987665 is an apocalyptic number.

499987665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

499987665 is a deficient number, since it is larger than the sum of its proper divisors (372994263).

499987665 is a wasteful number, since it uses less digits than its factorization.

499987665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81249 (or 81246 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 63.

The square root of 499987665 is about 22360.4039543117. The cubic root of 499987665 is about 793.6939990664.

The spelling of 499987665 in words is "four hundred ninety-nine million, nine hundred eighty-seven thousand, six hundred sixty-five".