264440633203121 has 4 divisors (see below), whose sum is σ = 264441368387700. Its totient is φ = 264439898018544.

The previous prime is 264440633203093. The next prime is 264440633203259. The reversal of 264440633203121 is 121302336044462.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 129587806064896 + 134852827138225 = 11383664^2 + 11612615^2 .

It is a cyclic number.

It is not a de Polignac number, because 264440633203121 - 2⁴² = 260042586692017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264440633202121) 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 in 3 ways as a sum of consecutive naturals, for example, 367052486 + ... + 367772223.

It is an arithmetic number, because the mean of its divisors is an integer number (66110342096925).

Almost surely, 2^{264440633203121} is an apocalyptic number.

It is an amenable number.

264440633203121 is a deficient number, since it is larger than the sum of its proper divisors (735184579).

264440633203121 is an equidigital number, since it uses as much as digits as its factorization.

264440633203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735184578.

The product of its (nonzero) digits is 497664, while the sum is 41.

Adding to 264440633203121 its reverse (121302336044462), we get a palindrome (385742969247583).

The spelling of 264440633203121 in words is "two hundred sixty-four trillion, four hundred forty billion, six hundred thirty-three million, two hundred three thousand, one hundred twenty-one".