564342465501821 has 2 divisors, whose sum is σ = 564342465501822. Its totient is φ = 564342465501820.

The previous prime is 564342465501761. The next prime is 564342465501827. The reversal of 564342465501821 is 128105564243465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490789303675225 + 73553161826596 = 22153765^2 + 8576314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-564342465501821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (564342465501827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282171232750910 + 282171232750911.

It is an arithmetic number, because the mean of its divisors is an integer number (282171232750911).

Almost surely, 2^{564342465501821} is an apocalyptic number.

It is an amenable number.

564342465501821 is a deficient number, since it is larger than the sum of its proper divisors (1).

564342465501821 is an equidigital number, since it uses as much as digits as its factorization.

564342465501821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648000, while the sum is 56.

The spelling of 564342465501821 in words is "five hundred sixty-four trillion, three hundred forty-two billion, four hundred sixty-five million, five hundred one thousand, eight hundred twenty-one".