255806181077 has 4 divisors (see below), whose sum is σ = 256021688736. Its totient is φ = 255590673420.

The previous prime is 255806181067. The next prime is 255806181091. The reversal of 255806181077 is 770181608552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255806181077 - 2⁸ = 255806180821 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 (255806181067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107752049 + ... + 107754422.

It is an arithmetic number, because the mean of its divisors is an integer number (64005422184).

Almost surely, 2^255806181077 is an apocalyptic number.

It is an amenable number.

255806181077 is a deficient number, since it is larger than the sum of its proper divisors (215507659).

255806181077 is a wasteful number, since it uses less digits than its factorization.

255806181077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215507658.

The product of its (nonzero) digits is 940800, while the sum is 50.

The spelling of 255806181077 in words is "two hundred fifty-five billion, eight hundred six million, one hundred eighty-one thousand, seventy-seven".