256511455 has 8 divisors (see below), whose sum is σ = 308502000. Its totient is φ = 204750336.

The previous prime is 256511407. The next prime is 256511471. The reversal of 256511455 is 554115652.

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 256511455 - 2⁷ = 256511327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256511455.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 54885 + ... + 59374.

It is an arithmetic number, because the mean of its divisors is an integer number (38562750).

Almost surely, 2^256511455 is an apocalyptic number.

256511455 is a deficient number, since it is larger than the sum of its proper divisors (51990545).

256511455 is a wasteful number, since it uses less digits than its factorization.

256511455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114713.

The product of its digits is 30000, while the sum is 34.

The square root of 256511455 is about 16015.9749937367. The cubic root of 256511455 is about 635.3829958520.

The spelling of 256511455 in words is "two hundred fifty-six million, five hundred eleven thousand, four hundred fifty-five".