255556069 has 4 divisors (see below), whose sum is σ = 255588300. Its totient is φ = 255523840.

The previous prime is 255556057. The next prime is 255556111. The reversal of 255556069 is 960655552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 145515969 + 110040100 = 12063^2 + 10490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255556069 is a prime.

It is a super-2 number, since 2×255556069² = 130617808805465522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255556039) 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, 5007 + ... + 23155.

It is an arithmetic number, because the mean of its divisors is an integer number (63897075).

Almost surely, 2^255556069 is an apocalyptic number.

It is an amenable number.

255556069 is a deficient number, since it is larger than the sum of its proper divisors (32231).

255556069 is a wasteful number, since it uses less digits than its factorization.

255556069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32230.

The product of its (nonzero) digits is 405000, while the sum is 43.

The square root of 255556069 is about 15986.1211367861. The cubic root of 255556069 is about 634.5931789807.

The spelling of 255556069 in words is "two hundred fifty-five million, five hundred fifty-six thousand, sixty-nine".