265220663 has 4 divisors (see below), whose sum is σ = 265369728. Its totient is φ = 265071600.

The previous prime is 265220611. The next prime is 265220693. The reversal of 265220663 is 366022562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366022562 = 2 ⋅183011281.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265220663 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 (265220693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71831 + ... + 75432.

It is an arithmetic number, because the mean of its divisors is an integer number (66342432).

Almost surely, 2^265220663 is an apocalyptic number.

265220663 is a deficient number, since it is larger than the sum of its proper divisors (149065).

265220663 is a wasteful number, since it uses less digits than its factorization.

265220663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149064.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 265220663 is about 16285.5967959421. The cubic root of 265220663 is about 642.4940628378.

The spelling of 265220663 in words is "two hundred sixty-five million, two hundred twenty thousand, six hundred sixty-three".