260365561 has 4 divisors (see below), whose sum is σ = 262798992. Its totient is φ = 257932132.

The previous prime is 260365471. The next prime is 260365583. The reversal of 260365561 is 165563062.

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 260365561 - 2⁷ = 260365433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260369561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1216555 + ... + 1216768.

It is an arithmetic number, because the mean of its divisors is an integer number (65699748).

Almost surely, 2^260365561 is an apocalyptic number.

It is an amenable number.

260365561 is a deficient number, since it is larger than the sum of its proper divisors (2433431).

260365561 is a wasteful number, since it uses less digits than its factorization.

260365561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2433430.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 260365561 is about 16135.8470803364. The cubic root of 260365561 is about 638.5494173237.

The spelling of 260365561 in words is "two hundred sixty million, three hundred sixty-five thousand, five hundred sixty-one".