646054553117 has 2 divisors, whose sum is σ = 646054553118. Its totient is φ = 646054553116.

The previous prime is 646054553107. The next prime is 646054553141. The reversal of 646054553117 is 711355450646.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645602608036 + 451945081 = 803494^2 + 21259^2 .

It is a cyclic number.

It is not a de Polignac number, because 646054553117 - 2⁴ = 646054553101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646054553107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323027276558 + 323027276559.

It is an arithmetic number, because the mean of its divisors is an integer number (323027276559).

Almost surely, 2^646054553117 is an apocalyptic number.

It is an amenable number.

646054553117 is a deficient number, since it is larger than the sum of its proper divisors (1).

646054553117 is an equidigital number, since it uses as much as digits as its factorization.

646054553117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512000, while the sum is 47.

The spelling of 646054553117 in words is "six hundred forty-six billion, fifty-four million, five hundred fifty-three thousand, one hundred seventeen".