1256344855 has 8 divisors (see below), whose sum is σ = 1525778352. Its totient is φ = 992966208.

The previous prime is 1256344813. The next prime is 1256344891. The reversal of 1256344855 is 5584436521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1256344855 - 2⁹ = 1256344343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1513254 + ... + 1514083.

It is an arithmetic number, because the mean of its divisors is an integer number (190722294).

Almost surely, 2^1256344855 is an apocalyptic number.

1256344855 is a deficient number, since it is larger than the sum of its proper divisors (269433497).

1256344855 is an equidigital number, since it uses as much as digits as its factorization.

1256344855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3027425.

The product of its digits is 576000, while the sum is 43.

The square root of 1256344855 is about 35444.9552828044. The cubic root of 1256344855 is about 1079.0368799923.

The spelling of 1256344855 in words is "one billion, two hundred fifty-six million, three hundred forty-four thousand, eight hundred fifty-five".