1255812555 has 16 divisors (see below), whose sum is σ = 2023969824. Its totient is φ = 664876800.

The previous prime is 1255812553. The next prime is 1255812563. The reversal of 1255812555 is 5552185521.

It is not a de Polignac number, because 1255812555 - 2¹ = 1255812553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255812553) 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 15 ways as a sum of consecutive naturals, for example, 303496 + ... + 307605.

It is an arithmetic number, because the mean of its divisors is an integer number (126498114).

Almost surely, 2^1255812555 is an apocalyptic number.

1255812555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1255812555 is a deficient number, since it is larger than the sum of its proper divisors (768157269).

1255812555 is a wasteful number, since it uses less digits than its factorization.

1255812555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611246.

The product of its digits is 100000, while the sum is 39.

The square root of 1255812555 is about 35437.4456613340. The cubic root of 1255812555 is about 1078.8844663015.

The spelling of 1255812555 in words is "one billion, two hundred fifty-five million, eight hundred twelve thousand, five hundred fifty-five".