6501894399 has 144 divisors (see below), whose sum is σ = 13046971392. Its totient is φ = 3013200000.

The previous prime is 6501894397. The next prime is 6501894407. The reversal of 6501894399 is 9934981056.

6501894399 is a `hidden beast` number, since 6 + 501 + 8 + 9 + 43 + 99 = 666.

It is not a de Polignac number, because 6501894399 - 2¹ = 6501894397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6501894397) 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 143 ways as a sum of consecutive naturals, for example, 8657274 + ... + 8658024.

It is an arithmetic number, because the mean of its divisors is an integer number (90603968).

Almost surely, 2^6501894399 is an apocalyptic number.

6501894399 is an abundant number, since it is smaller than the sum of its proper divisors (6545076993).

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

6501894399 is a wasteful number, since it uses less digits than its factorization.

6501894399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The square root of 6501894399 is about 80634.3251909508. The cubic root of 6501894399 is about 1866.4368650391.

The spelling of 6501894399 in words is "six billion, five hundred one million, eight hundred ninety-four thousand, three hundred ninety-nine".