265133913291721 has 2 divisors, whose sum is σ = 265133913291722. Its totient is φ = 265133913291720.

The previous prime is 265133913291719. The next prime is 265133913291727. The reversal of 265133913291721 is 127192319331562.

265133913291721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245880589136400 + 19253324155321 = 15680580^2 + 4387861^2 .

It is a cyclic number.

It is not a de Polignac number, because 265133913291721 - 2¹ = 265133913291719 is a prime.

Together with 265133913291719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (265133913291727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132566956645860 + 132566956645861.

It is an arithmetic number, because the mean of its divisors is an integer number (132566956645861).

Almost surely, 2^{265133913291721} is an apocalyptic number.

It is an amenable number.

265133913291721 is a deficient number, since it is larger than the sum of its proper divisors (1).

265133913291721 is an equidigital number, since it uses as much as digits as its factorization.

265133913291721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 55.

The spelling of 265133913291721 in words is "two hundred sixty-five trillion, one hundred thirty-three billion, nine hundred thirteen million, two hundred ninety-one thousand, seven hundred twenty-one".