499999975555509 has 160 divisors (see below), whose sum is σ = 880176492695808. Its totient is φ = 278865151488000.

The previous prime is 499999975555463. The next prime is 499999975555559. The reversal of 499999975555509 is 905555579999994.

499999975555509 is a `hidden beast` number, since 499 + 9 + 9 + 9 + 9 + 7 + 5 + 5 + 55 + 50 + 9 = 666.

It is not a de Polignac number, because 499999975555509 - 2¹¹ = 499999975553461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (99).

It is a self number, because there is not a number n which added to its sum of digits gives 499999975555509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499999975555559) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 22819576264 + ... + 22819598174.

Almost surely, 2^{499999975555509} is an apocalyptic number.

It is an amenable number.

499999975555509 is a deficient number, since it is larger than the sum of its proper divisors (380176517140299).

499999975555509 is a wasteful number, since it uses less digits than its factorization.

499999975555509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27881 (or 27872 counting only the distinct ones).

The product of its (nonzero) digits is 418509787500, while the sum is 99.

It can be divided in two parts, 4999999 and 75555509, that added together give a palindrome (80555508).

The spelling of 499999975555509 in words is "four hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred seventy-five million, five hundred fifty-five thousand, five hundred nine".