499649645881 has 27 divisors (see below), whose sum is σ = 530831993517. Its totient is φ = 470259155520.

The previous prime is 499649645837. The next prime is 499649645893. The reversal of 499649645881 is 188546946994.

The square root of 499649645881 is 706859.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 182324730025 + 317324915856 = 426995^2 + 563316^2 .

It is not a de Polignac number, because 499649645881 - 2¹⁷ = 499649514809 is a prime.

It is a super-3 number, since 3×499649645881³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (73).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (499649645281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1186816051 + ... + 1186816471.

Almost surely, 2^499649645881 is an apocalyptic number.

499649645881 is the 706859-th square number.

499649645881 is the 353430-th centered octagonal number.

It is an amenable number.

499649645881 is a deficient number, since it is larger than the sum of its proper divisors (31182347636).

499649645881 is an frugal number, since it uses more digits than its factorization.

499649645881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034 (or 517 counting only the distinct ones).

The product of its digits is 537477120, while the sum is 73.

The spelling of 499649645881 in words is "four hundred ninety-nine billion, six hundred forty-nine million, six hundred forty-five thousand, eight hundred eighty-one".