1256763255 has 64 divisors (see below), whose sum is σ = 2247478272. Its totient is φ = 594570240.

The previous prime is 1256763251. The next prime is 1256763259. The reversal of 1256763255 is 5523676521.

It is an interprime number because it is at equal distance from previous prime (1256763251) and next prime (1256763259).

It is not a de Polignac number, because 1256763255 - 2² = 1256763251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256763251) 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 63 ways as a sum of consecutive naturals, for example, 1240129 + ... + 1241141.

It is an arithmetic number, because the mean of its divisors is an integer number (35116848).

Almost surely, 2^1256763255 is an apocalyptic number.

1256763255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1256763255 is a deficient number, since it is larger than the sum of its proper divisors (990715017).

1256763255 is a wasteful number, since it uses less digits than its factorization.

1256763255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208.

The product of its digits is 378000, while the sum is 42.

The square root of 1256763255 is about 35450.8569007859. The cubic root of 1256763255 is about 1079.1566504307.

The spelling of 1256763255 in words is "one billion, two hundred fifty-six million, seven hundred sixty-three thousand, two hundred fifty-five".