64854243855109 has 2 divisors, whose sum is σ = 64854243855110. Its totient is φ = 64854243855108.

The previous prime is 64854243855101. The next prime is 64854243855157. The reversal of 64854243855109 is 90155834245846.

64854243855109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61317200080900 + 3537043774209 = 7830530^2 + 1880703^2 .

It is a cyclic number.

It is not a de Polignac number, because 64854243855109 - 2³ = 64854243855101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64854243855101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32427121927554 + 32427121927555.

It is an arithmetic number, because the mean of its divisors is an integer number (32427121927555).

Almost surely, 2^{64854243855109} is an apocalyptic number.

It is an amenable number.

64854243855109 is a deficient number, since it is larger than the sum of its proper divisors (1).

64854243855109 is an equidigital number, since it uses as much as digits as its factorization.

64854243855109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888000, while the sum is 64.

The spelling of 64854243855109 in words is "sixty-four trillion, eight hundred fifty-four billion, two hundred forty-three million, eight hundred fifty-five thousand, one hundred nine".