265218761 has 4 divisors (see below), whose sum is σ = 265351632. Its totient is φ = 265085892.

The previous prime is 265218749. The next prime is 265218769. The reversal of 265218761 is 167812562.

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 not a de Polignac number, because 265218761 - 2¹⁰ = 265217737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265218769) 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, 63395 + ... + 67448.

It is an arithmetic number, because the mean of its divisors is an integer number (66337908).

Almost surely, 2^265218761 is an apocalyptic number.

It is an amenable number.

265218761 is a deficient number, since it is larger than the sum of its proper divisors (132871).

265218761 is a wasteful number, since it uses less digits than its factorization.

265218761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132870.

The product of its digits is 40320, while the sum is 38.

The square root of 265218761 is about 16285.5384006793. The cubic root of 265218761 is about 642.4925269763.

The spelling of 265218761 in words is "two hundred sixty-five million, two hundred eighteen thousand, seven hundred sixty-one".