264433764781 has 2 divisors, whose sum is σ = 264433764782. Its totient is φ = 264433764780.

The previous prime is 264433764737. The next prime is 264433764799. The reversal of 264433764781 is 187467334462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169636896900 + 94796867881 = 411870^2 + 307891^2 .

It is a cyclic number.

It is not a de Polignac number, because 264433764781 - 2⁷ = 264433764653 is a prime.

It is a super-2 number, since 2×264433764781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264433762781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132216882390 + 132216882391.

It is an arithmetic number, because the mean of its divisors is an integer number (132216882391).

Almost surely, 2^264433764781 is an apocalyptic number.

It is an amenable number.

264433764781 is a deficient number, since it is larger than the sum of its proper divisors (1).

264433764781 is an equidigital number, since it uses as much as digits as its factorization.

264433764781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16257024, while the sum is 55.

The spelling of 264433764781 in words is "two hundred sixty-four billion, four hundred thirty-three million, seven hundred sixty-four thousand, seven hundred eighty-one".