549999999540 has 72 divisors (see below), whose sum is σ = 1668909610368. Its totient is φ = 146616004800.

The previous prime is 549999999517. The next prime is 549999999541. The reversal of 549999999540 is 45999999945.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 549999999540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549999999541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3736 + ... + 1048815.

It is an arithmetic number, because the mean of its divisors is an integer number (23179300144).

Almost surely, 2^549999999540 is an apocalyptic number.

It is an amenable number.

549999999540 is an abundant number, since it is smaller than the sum of its proper divisors (1118909610828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

549999999540 is a wasteful number, since it uses less digits than its factorization.

549999999540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055469 (or 1055464 counting only the distinct ones).

The product of its (nonzero) digits is 1913187600, while the sum is 81.

The spelling of 549999999540 in words is "five hundred forty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, five hundred forty".