265261257050721 has 64 divisors (see below), whose sum is σ = 371844179566848. Its totient is φ = 168035882876928.

The previous prime is 265261257050719. The next prime is 265261257050747. The reversal of 265261257050721 is 127050752162562.

It is a happy number.

It is not a de Polignac number, because 265261257050721 - 2¹ = 265261257050719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (265261257050791) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 453878125 + ... + 454462181.

It is an arithmetic number, because the mean of its divisors is an integer number (5810065305732).

Almost surely, 2^{265261257050721} is an apocalyptic number.

It is an amenable number.

265261257050721 is a deficient number, since it is larger than the sum of its proper divisors (106582922516127).

265261257050721 is a wasteful number, since it uses less digits than its factorization.

265261257050721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584690.

The product of its (nonzero) digits is 3528000, while the sum is 51.

The spelling of 265261257050721 in words is "two hundred sixty-five trillion, two hundred sixty-one billion, two hundred fifty-seven million, fifty thousand, seven hundred twenty-one".