564623646621409 has 2 divisors, whose sum is σ = 564623646621410. Its totient is φ = 564623646621408.

The previous prime is 564623646621407. The next prime is 564623646621539. The reversal of 564623646621409 is 904126646326465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426148931390625 + 138474715230784 = 20643375^2 + 11767528^2 .

It is a cyclic number.

It is not a de Polignac number, because 564623646621409 - 2¹ = 564623646621407 is a prime.

Together with 564623646621407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (564623646621401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282311823310704 + 282311823310705.

It is an arithmetic number, because the mean of its divisors is an integer number (282311823310705).

Almost surely, 2^{564623646621409} is an apocalyptic number.

It is an amenable number.

564623646621409 is a deficient number, since it is larger than the sum of its proper divisors (1).

564623646621409 is an equidigital number, since it uses as much as digits as its factorization.

564623646621409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 268738560, while the sum is 64.

The spelling of 564623646621409 in words is "five hundred sixty-four trillion, six hundred twenty-three billion, six hundred forty-six million, six hundred twenty-one thousand, four hundred nine".