6491644085233 has 2 divisors, whose sum is σ = 6491644085234. Its totient is φ = 6491644085232.

The previous prime is 6491644085197. The next prime is 6491644085237. The reversal of 6491644085233 is 3325804461946.

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., 6401218783969 + 90425301264 = 2530063^2 + 300708^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6491644085233 is a prime.

It is not a weakly prime, because it can be changed into another prime (6491644085237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3245822042616 + 3245822042617.

It is an arithmetic number, because the mean of its divisors is an integer number (3245822042617).

Almost surely, 2^{6491644085233} is an apocalyptic number.

It is an amenable number.

6491644085233 is a deficient number, since it is larger than the sum of its proper divisors (1).

6491644085233 is an equidigital number, since it uses as much as digits as its factorization.

6491644085233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14929920, while the sum is 55.

The spelling of 6491644085233 in words is "six trillion, four hundred ninety-one billion, six hundred forty-four million, eighty-five thousand, two hundred thirty-three".