646563542633 has 2 divisors, whose sum is σ = 646563542634. Its totient is φ = 646563542632.

The previous prime is 646563542563. The next prime is 646563542743. The reversal of 646563542633 is 336245365646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361890074329 + 284673468304 = 601573^2 + 533548^2 .

It is a cyclic number.

It is not a de Polignac number, because 646563542633 - 2¹⁶ = 646563477097 is a prime.

It is not a weakly prime, because it can be changed into another prime (646563541633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323281771316 + 323281771317.

It is an arithmetic number, because the mean of its divisors is an integer number (323281771317).

Almost surely, 2^646563542633 is an apocalyptic number.

It is an amenable number.

646563542633 is a deficient number, since it is larger than the sum of its proper divisors (1).

646563542633 is an equidigital number, since it uses as much as digits as its factorization.

646563542633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27993600, while the sum is 53.

The spelling of 646563542633 in words is "six hundred forty-six billion, five hundred sixty-three million, five hundred forty-two thousand, six hundred thirty-three".