64866266813 has 2 divisors, whose sum is σ = 64866266814. Its totient is φ = 64866266812.

The previous prime is 64866266783. The next prime is 64866266873. The reversal of 64866266813 is 31866266846.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55867467769 + 8998799044 = 236363^2 + 94862^2 .

It is a cyclic number.

It is not a de Polignac number, because 64866266813 - 2¹² = 64866262717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64866266873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32433133406 + 32433133407.

It is an arithmetic number, because the mean of its divisors is an integer number (32433133407).

Almost surely, 2^64866266813 is an apocalyptic number.

It is an amenable number.

64866266813 is a deficient number, since it is larger than the sum of its proper divisors (1).

64866266813 is an equidigital number, since it uses as much as digits as its factorization.

64866266813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11943936, while the sum is 56.

The spelling of 64866266813 in words is "sixty-four billion, eight hundred sixty-six million, two hundred sixty-six thousand, eight hundred thirteen".