6503917851 has 48 divisors (see below), whose sum is σ = 10424082240. Its totient is φ = 3886755840.

The previous prime is 6503917801. The next prime is 6503917859. The reversal of 6503917851 is 1587193056.

It is a happy number.

6503917851 is a `hidden beast` number, since 6 + 503 + 91 + 7 + 8 + 51 = 666.

It is not a de Polignac number, because 6503917851 - 2⁷ = 6503917723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6503917797 and 6503917806.

It is not an unprimeable number, because it can be changed into a prime (6503917859) 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 47 ways as a sum of consecutive naturals, for example, 844245 + ... + 851913.

It is an arithmetic number, because the mean of its divisors is an integer number (217168380).

Almost surely, 2^6503917851 is an apocalyptic number.

6503917851 is a deficient number, since it is larger than the sum of its proper divisors (3920164389).

6503917851 is a wasteful number, since it uses less digits than its factorization.

6503917851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7956 (or 7953 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 6503917851 is about 80646.8713032316. The cubic root of 6503917851 is about 1866.6304626517.

The spelling of 6503917851 in words is "six billion, five hundred three million, nine hundred seventeen thousand, eight hundred fifty-one".