63564562921 has 2 divisors, whose sum is σ = 63564562922. Its totient is φ = 63564562920.

The previous prime is 63564562903. The next prime is 63564562951. The reversal of 63564562921 is 12926546536.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59321473600 + 4243089321 = 243560^2 + 65139^2 .

It is a cyclic number.

It is not a de Polignac number, because 63564562921 - 2⁹ = 63564562409 is a prime.

It is not a weakly prime, because it can be changed into another prime (63564562951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31782281460 + 31782281461.

It is an arithmetic number, because the mean of its divisors is an integer number (31782281461).

Almost surely, 2^63564562921 is an apocalyptic number.

It is an amenable number.

63564562921 is a deficient number, since it is larger than the sum of its proper divisors (1).

63564562921 is an equidigital number, since it uses as much as digits as its factorization.

63564562921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 49.

The spelling of 63564562921 in words is "sixty-three billion, five hundred sixty-four million, five hundred sixty-two thousand, nine hundred twenty-one".