265630261 has 4 divisors (see below), whose sum is σ = 286063372. Its totient is φ = 245197152.

The previous prime is 265630247. The next prime is 265630271. The reversal of 265630261 is 162036562.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15800625 + 249829636 = 3975^2 + 15806^2 .

It is a cyclic number.

It is not a de Polignac number, because 265630261 - 2⁷ = 265630133 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 (265630231) 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, 10216536 + ... + 10216561.

It is an arithmetic number, because the mean of its divisors is an integer number (71515843).

Almost surely, 2^265630261 is an apocalyptic number.

It is an amenable number.

265630261 is a deficient number, since it is larger than the sum of its proper divisors (20433111).

265630261 is a wasteful number, since it uses less digits than its factorization.

265630261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20433110.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 265630261 is about 16298.1674123197. The cubic root of 265630261 is about 642.8246415620.

The spelling of 265630261 in words is "two hundred sixty-five million, six hundred thirty thousand, two hundred sixty-one".