264334433336581 has 2 divisors, whose sum is σ = 264334433336582. Its totient is φ = 264334433336580.

The previous prime is 264334433336573. The next prime is 264334433336639. The reversal of 264334433336581 is 185633334433462.

It is an a-pointer prime, because the next prime (264334433336639) can be obtained adding 264334433336581 to its sum of digits (58).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244923439000900 + 19410994335681 = 15650030^2 + 4405791^2 .

It is a cyclic number.

It is not a de Polignac number, because 264334433336581 - 2³ = 264334433336573 is a prime.

It is a super-2 number, since 2×264334433336581² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264334433376581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132167216668290 + 132167216668291.

It is an arithmetic number, because the mean of its divisors is an integer number (132167216668291).

Almost surely, 2^{264334433336581} is an apocalyptic number.

It is an amenable number.

264334433336581 is a deficient number, since it is larger than the sum of its proper divisors (1).

264334433336581 is an equidigital number, since it uses as much as digits as its factorization.

264334433336581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134369280, while the sum is 58.

The spelling of 264334433336581 in words is "two hundred sixty-four trillion, three hundred thirty-four billion, four hundred thirty-three million, three hundred thirty-six thousand, five hundred eighty-one".