268565561 has 4 divisors (see below), whose sum is σ = 292980624. Its totient is φ = 244150500.

The previous prime is 268565543. The next prime is 268565579. The reversal of 268565561 is 165565862.

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 an interprime number because it is at equal distance from previous prime (268565543) and next prime (268565579).

It is not a de Polignac number, because 268565561 - 2¹⁸ = 268303417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268565501) 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, 12207515 + ... + 12207536.

It is an arithmetic number, because the mean of its divisors is an integer number (73245156).

Almost surely, 2^268565561 is an apocalyptic number.

It is an amenable number.

268565561 is a deficient number, since it is larger than the sum of its proper divisors (24415063).

268565561 is a wasteful number, since it uses less digits than its factorization.

268565561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24415062.

The product of its digits is 432000, while the sum is 44.

The square root of 268565561 is about 16387.9700085154. The cubic root of 268565561 is about 645.1837795319.

The spelling of 268565561 in words is "two hundred sixty-eight million, five hundred sixty-five thousand, five hundred sixty-one".