1256065855 has 16 divisors (see below), whose sum is σ = 1656144000. Its totient is φ = 906924960.

The previous prime is 1256065849. The next prime is 1256065861. The reversal of 1256065855 is 5585606521.

It is an interprime number because it is at equal distance from previous prime (1256065849) and next prime (1256065861).

It is a de Polignac number, because none of the positive numbers 2^k-1256065855 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74505 + ... + 89794.

It is an arithmetic number, because the mean of its divisors is an integer number (103509000).

Almost surely, 2^1256065855 is an apocalyptic number.

1256065855 is a deficient number, since it is larger than the sum of its proper divisors (400078145).

1256065855 is a wasteful number, since it uses less digits than its factorization.

1256065855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164454.

The product of its (nonzero) digits is 360000, while the sum is 43.

The square root of 1256065855 is about 35441.0193843236. The cubic root of 1256065855 is about 1078.9569991707.

The spelling of 1256065855 in words is "one billion, two hundred fifty-six million, sixty-five thousand, eight hundred fifty-five".