255678888609 has 45 divisors (see below), whose sum is σ = 403236549507. Its totient is φ = 161426793456.

The previous prime is 255678888601. The next prime is 255678888611. The reversal of 255678888609 is 906888876552.

The square root of 255678888609 is 505647.

It is a perfect power (a square), and thus also a powerful number.

255678888609 is a `hidden beast` number, since 2 + 5 + 5 + 6 + 7 + 8 + 8 + 8 + 8 + 609 = 666.

It can be written as a sum of positive squares in only one way, i.e., 47534900625 + 208143987984 = 218025^2 + 456228^2 .

It is not a de Polignac number, because 255678888609 - 2³ = 255678888601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (255678888601) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 86464159 + ... + 86467115.

Almost surely, 2^255678888609 is an apocalyptic number.

255678888609 is the 505647-th square number.

255678888609 is the 252824-th centered octagonal number.

It is an amenable number.

255678888609 is a deficient number, since it is larger than the sum of its proper divisors (147557660898).

255678888609 is an frugal number, since it uses more digits than its factorization.

255678888609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5964 (or 2979 counting only the distinct ones).

The product of its (nonzero) digits is 464486400, while the sum is 72.

The spelling of 255678888609 in words is "two hundred fifty-five billion, six hundred seventy-eight million, eight hundred eighty-eight thousand, six hundred nine".