255218643 has 12 divisors (see below), whose sum is σ = 368787640. Its totient is φ = 170081856.

The previous prime is 255218641. The next prime is 255218657. The reversal of 255218643 is 346812552.

255218643 is a `hidden beast` number, since 2 + 5 + 5 + 2 + 1 + 8 + 643 = 666.

It is not a de Polignac number, because 255218643 - 2¹ = 255218641 is a prime.

It is a super-2 number, since 2×255218643² = 130273111469522898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 255218598 and 255218607.

It is not an unprimeable number, because it can be changed into a prime (255218641) 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 11 ways as a sum of consecutive naturals, for example, 44388 + ... + 49806.

Almost surely, 2^255218643 is an apocalyptic number.

255218643 is a deficient number, since it is larger than the sum of its proper divisors (113568997).

255218643 is a wasteful number, since it uses less digits than its factorization.

255218643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10658 (or 10655 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 255218643 is about 15975.5639337083. The cubic root of 255218643 is about 634.3137588256.

The spelling of 255218643 in words is "two hundred fifty-five million, two hundred eighteen thousand, six hundred forty-three".