64368466921609 has 2 divisors, whose sum is σ = 64368466921610. Its totient is φ = 64368466921608.

The previous prime is 64368466921537. The next prime is 64368466921613. The reversal of 64368466921609 is 90612966486346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60966113286400 + 3402353635209 = 7808080^2 + 1844547^2 .

It is a cyclic number.

It is not a de Polignac number, because 64368466921609 - 2⁹ = 64368466921097 is a prime.

It is a super-2 number, since 2×64368466921609² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64368466921699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32184233460804 + 32184233460805.

It is an arithmetic number, because the mean of its divisors is an integer number (32184233460805).

Almost surely, 2^{64368466921609} is an apocalyptic number.

It is an amenable number.

64368466921609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64368466921609 is an equidigital number, since it uses as much as digits as its factorization.

64368466921609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483729408, while the sum is 70.

The spelling of 64368466921609 in words is "sixty-four trillion, three hundred sixty-eight billion, four hundred sixty-six million, nine hundred twenty-one thousand, six hundred nine".