265235506523021 has 2 divisors, whose sum is σ = 265235506523022. Its totient is φ = 265235506523020.

The previous prime is 265235506522979. The next prime is 265235506523033. The reversal of 265235506523021 is 120325605532562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202113848055625 + 63121658467396 = 14216675^2 + 7944914^2 .

It is a cyclic number.

It is not a de Polignac number, because 265235506523021 - 2¹⁴ = 265235506506637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265235506523081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132617753261510 + 132617753261511.

It is an arithmetic number, because the mean of its divisors is an integer number (132617753261511).

Almost surely, 2^{265235506523021} is an apocalyptic number.

It is an amenable number.

265235506523021 is a deficient number, since it is larger than the sum of its proper divisors (1).

265235506523021 is an equidigital number, since it uses as much as digits as its factorization.

265235506523021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240000, while the sum is 47.

The spelling of 265235506523021 in words is "two hundred sixty-five trillion, two hundred thirty-five billion, five hundred six million, five hundred twenty-three thousand, twenty-one".