255563643 has 8 divisors (see below), whose sum is σ = 340825408. Its totient is φ = 170338824.

The previous prime is 255563641. The next prime is 255563647. The reversal of 255563643 is 346365552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 255563643 - 2¹ = 255563641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255563641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21996 + ... + 31542.

It is an arithmetic number, because the mean of its divisors is an integer number (42603176).

Almost surely, 2^255563643 is an apocalyptic number.

255563643 is a deficient number, since it is larger than the sum of its proper divisors (85261765).

255563643 is an equidigital number, since it uses as much as digits as its factorization.

255563643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18473.

The product of its digits is 324000, while the sum is 39.

The square root of 255563643 is about 15986.3580280188. The cubic root of 255563643 is about 634.5994481349.

The spelling of 255563643 in words is "two hundred fifty-five million, five hundred sixty-three thousand, six hundred forty-three".