6503317861 has 2 divisors, whose sum is σ = 6503317862. Its totient is φ = 6503317860.

The previous prime is 6503317817. The next prime is 6503317867. The reversal of 6503317861 is 1687133056.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4046232100 + 2457085761 = 63610^2 + 49569^2 .

It is a cyclic number.

It is not a de Polignac number, because 6503317861 - 2²³ = 6494929253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6503317867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3251658930 + 3251658931.

It is an arithmetic number, because the mean of its divisors is an integer number (3251658931).

Almost surely, 2^6503317861 is an apocalyptic number.

It is an amenable number.

6503317861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6503317861 is an equidigital number, since it uses as much as digits as its factorization.

6503317861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 6503317861 is about 80643.1513583144. The cubic root of 6503317861 is about 1866.5730616575.

The spelling of 6503317861 in words is "six billion, five hundred three million, three hundred seventeen thousand, eight hundred sixty-one".