6491547536 has 20 divisors (see below), whose sum is σ = 12590277132. Its totient is φ = 3242443776.

The previous prime is 6491547533. The next prime is 6491547541. The reversal of 6491547536 is 6357451946.

It can be written as a sum of positive squares in 2 ways, for example, as 2595291136 + 3896256400 = 50944^2 + 62420^2 .

It is not an unprimeable number, because it can be changed into a prime (6491547533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192005 + ... + 223268.

Almost surely, 2^6491547536 is an apocalyptic number.

It is an amenable number.

6491547536 is a deficient number, since it is larger than the sum of its proper divisors (6098729596).

6491547536 is a wasteful number, since it uses less digits than its factorization.

6491547536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416258 (or 416252 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 50.

The square root of 6491547536 is about 80570.1404739994. The cubic root of 6491547536 is about 1865.4462809406.

The spelling of 6491547536 in words is "six billion, four hundred ninety-one million, five hundred forty-seven thousand, five hundred thirty-six".