264744818861 has 2 divisors, whose sum is σ = 264744818862. Its totient is φ = 264744818860.

The previous prime is 264744818851. The next prime is 264744818873. The reversal of 264744818861 is 168818447462.

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., 162404970025 + 102339848836 = 402995^2 + 319906^2 .

It is a cyclic number.

It is not a de Polignac number, because 264744818861 - 2⁶ = 264744818797 is a prime.

It is a super-2 number, since 2×264744818861² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 264744818861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264744818851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132372409430 + 132372409431.

It is an arithmetic number, because the mean of its divisors is an integer number (132372409431).

Almost surely, 2^264744818861 is an apocalyptic number.

It is an amenable number.

264744818861 is a deficient number, since it is larger than the sum of its proper divisors (1).

264744818861 is an equidigital number, since it uses as much as digits as its factorization.

264744818861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16515072, while the sum is 59.

The spelling of 264744818861 in words is "two hundred sixty-four billion, seven hundred forty-four million, eight hundred eighteen thousand, eight hundred sixty-one".