6491644085237 has 2 divisors, whose sum is σ = 6491644085238. Its totient is φ = 6491644085236.

The previous prime is 6491644085233. The next prime is 6491644085261. The reversal of 6491644085237 is 7325804461946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6190770991876 + 300873093361 = 2488126^2 + 548519^2 .

It is a cyclic number.

It is not a de Polignac number, because 6491644085237 - 2² = 6491644085233 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6491644085233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3245822042618 + 3245822042619.

It is an arithmetic number, because the mean of its divisors is an integer number (3245822042619).

It is a 1-persistent number, because it is pandigital, but 2⋅6491644085237 = 12983288170474 is not.

Almost surely, 2^{6491644085237} is an apocalyptic number.

It is an amenable number.

6491644085237 is a deficient number, since it is larger than the sum of its proper divisors (1).

6491644085237 is an equidigital number, since it uses as much as digits as its factorization.

6491644085237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34836480, while the sum is 59.

The spelling of 6491644085237 in words is "six trillion, four hundred ninety-one billion, six hundred forty-four million, eighty-five thousand, two hundred thirty-seven".