1256616255 has 16 divisors (see below), whose sum is σ = 2079917280. Its totient is φ = 647084928.

The previous prime is 1256616253. The next prime is 1256616269. The reversal of 1256616255 is 5526166521.

It is a happy number.

It is not a de Polignac number, because 1256616255 - 2¹ = 1256616253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256616253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1443952 + ... + 1444821.

It is an arithmetic number, because the mean of its divisors is an integer number (129994830).

Almost surely, 2^1256616255 is an apocalyptic number.

1256616255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1256616255 is a deficient number, since it is larger than the sum of its proper divisors (823301025).

1256616255 is a wasteful number, since it uses less digits than its factorization.

1256616255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888810.

The product of its digits is 108000, while the sum is 39.

The square root of 1256616255 is about 35448.7835475352. The cubic root of 1256616255 is about 1079.1145735021.

The spelling of 1256616255 in words is "one billion, two hundred fifty-six million, six hundred sixteen thousand, two hundred fifty-five".