265041553221 has 20 divisors (see below), whose sum is σ = 395940602464. Its totient is φ = 176687973000.

The previous prime is 265041553181. The next prime is 265041553241. The reversal of 265041553221 is 122355140562.

265041553221 is a `hidden beast` number, since 2 + 65 + 0 + 41 + 5 + 532 + 21 = 666.

It is not a de Polignac number, because 265041553221 - 2⁹ = 265041552709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265041553241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3517896 + ... + 3592446.

Almost surely, 2^265041553221 is an apocalyptic number.

It is an amenable number.

265041553221 is a deficient number, since it is larger than the sum of its proper divisors (130899049243).

265041553221 is an equidigital number, since it uses as much as digits as its factorization.

265041553221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118454 (or 118445 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 265041553221 its reverse (122355140562), we get a palindrome (387396693783).

The spelling of 265041553221 in words is "two hundred sixty-five billion, forty-one million, five hundred fifty-three thousand, two hundred twenty-one".