255888460981 has 4 divisors (see below), whose sum is σ = 260225553600. Its totient is φ = 251551368364.

The previous prime is 255888460967. The next prime is 255888460991. The reversal of 255888460981 is 189064888552.

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 255888460981 - 2¹⁷ = 255888329909 is a prime.

It is a super-2 number, since 2×255888460981² (a number of 24 digits) 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 (255888460921) 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 3 ways as a sum of consecutive naturals, for example, 2168546221 + ... + 2168546338.

It is an arithmetic number, because the mean of its divisors is an integer number (65056388400).

Almost surely, 2^255888460981 is an apocalyptic number.

It is an amenable number.

255888460981 is a deficient number, since it is larger than the sum of its proper divisors (4337092619).

255888460981 is an equidigital number, since it uses as much as digits as its factorization.

255888460981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4337092618.

The product of its (nonzero) digits is 44236800, while the sum is 64.

The spelling of 255888460981 in words is "two hundred fifty-five billion, eight hundred eighty-eight million, four hundred sixty thousand, nine hundred eighty-one".