264444242444509 has 2 divisors, whose sum is σ = 264444242444510. Its totient is φ = 264444242444508.

The previous prime is 264444242444449. The next prime is 264444242444521. The reversal of 264444242444509 is 905444242444462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262032890004900 + 2411352439609 = 16187430^2 + 1552853^2 .

It is a cyclic number.

It is not a de Polignac number, because 264444242444509 - 2¹³ = 264444242436317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264444242444549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132222121222254 + 132222121222255.

It is an arithmetic number, because the mean of its divisors is an integer number (132222121222255).

Almost surely, 2^{264444242444509} is an apocalyptic number.

It is an amenable number.

264444242444509 is a deficient number, since it is larger than the sum of its proper divisors (1).

264444242444509 is an equidigital number, since it uses as much as digits as its factorization.

264444242444509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141557760, while the sum is 58.

The spelling of 264444242444509 in words is "two hundred sixty-four trillion, four hundred forty-four billion, two hundred forty-two million, four hundred forty-four thousand, five hundred nine".