265142440451321 has 4 divisors (see below), whose sum is σ = 265142844630144. Its totient is φ = 265142036272500.

The previous prime is 265142440451279. The next prime is 265142440451359. The reversal of 265142440451321 is 123154044241562.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265142440451321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265142440451521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201103805 + ... + 202417946.

It is an arithmetic number, because the mean of its divisors is an integer number (66285711157536).

Almost surely, 2^{265142440451321} is an apocalyptic number.

It is an amenable number.

265142440451321 is a deficient number, since it is larger than the sum of its proper divisors (404178823).

265142440451321 is an equidigital number, since it uses as much as digits as its factorization.

265142440451321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404178822.

The product of its (nonzero) digits is 921600, while the sum is 44.

Adding to 265142440451321 its reverse (123154044241562), we get a palindrome (388296484692883).

The spelling of 265142440451321 in words is "two hundred sixty-five trillion, one hundred forty-two billion, four hundred forty million, four hundred fifty-one thousand, three hundred twenty-one".