6499404550540 has 96 divisors (see below), whose sum is σ = 14985840844800. Its totient is φ = 2348177982720.

The previous prime is 6499404550519. The next prime is 6499404550589. The reversal of 6499404550540 is 450554049946.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 23997357 + ... + 24266683.

It is an arithmetic number, because the mean of its divisors is an integer number (156102508800).

Almost surely, 2^{6499404550540} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6499404550540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7492920422400).

6499404550540 is an abundant number, since it is smaller than the sum of its proper divisors (8486436294260).

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

6499404550540 is a wasteful number, since it uses less digits than its factorization.

6499404550540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270055 (or 270053 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 55.

The spelling of 6499404550540 in words is "six trillion, four hundred ninety-nine billion, four hundred four million, five hundred fifty thousand, five hundred forty".