264505161 has 4 divisors (see below), whose sum is σ = 352673552. Its totient is φ = 176336772.

The previous prime is 264505127. The next prime is 264505187. The reversal of 264505161 is 161505462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 264505161 - 2¹⁸ = 264243017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (264501161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44084191 + ... + 44084196.

It is an arithmetic number, because the mean of its divisors is an integer number (88168388).

Almost surely, 2^264505161 is an apocalyptic number.

It is an amenable number.

264505161 is a deficient number, since it is larger than the sum of its proper divisors (88168391).

264505161 is an equidigital number, since it uses as much as digits as its factorization.

264505161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88168390.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 264505161 is about 16263.6146351295. The cubic root of 264505161 is about 641.9157773270.

The spelling of 264505161 in words is "two hundred sixty-four million, five hundred five thousand, one hundred sixty-one".