264162636581 has 2 divisors, whose sum is σ = 264162636582. Its totient is φ = 264162636580.

The previous prime is 264162636541. The next prime is 264162636583. The reversal of 264162636581 is 185636261462.

264162636581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223828341025 + 40334295556 = 473105^2 + 200834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264162636581 is a prime.

It is a super-2 number, since 2×264162636581² (a number of 24 digits) contains 22 as substring.

Together with 264162636583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264162636583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132081318290 + 132081318291.

It is an arithmetic number, because the mean of its divisors is an integer number (132081318291).

Almost surely, 2^264162636581 is an apocalyptic number.

It is an amenable number.

264162636581 is a deficient number, since it is larger than the sum of its proper divisors (1).

264162636581 is an equidigital number, since it uses as much as digits as its factorization.

264162636581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 50.

The spelling of 264162636581 in words is "two hundred sixty-four billion, one hundred sixty-two million, six hundred thirty-six thousand, five hundred eighty-one".