264194518481 has 2 divisors, whose sum is σ = 264194518482. Its totient is φ = 264194518480.

The previous prime is 264194518477. The next prime is 264194518507. The reversal of 264194518481 is 184815491462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242442988225 + 21751530256 = 492385^2 + 147484^2 .

It is a cyclic number.

It is not a de Polignac number, because 264194518481 - 2² = 264194518477 is a prime.

It is a super-2 number, since 2×264194518481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (264194568481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132097259240 + 132097259241.

It is an arithmetic number, because the mean of its divisors is an integer number (132097259241).

Almost surely, 2^264194518481 is an apocalyptic number.

It is an amenable number.

264194518481 is a deficient number, since it is larger than the sum of its proper divisors (1).

264194518481 is an equidigital number, since it uses as much as digits as its factorization.

264194518481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2211840, while the sum is 53.

The spelling of 264194518481 in words is "two hundred sixty-four billion, one hundred ninety-four million, five hundred eighteen thousand, four hundred eighty-one".