256555047 has 8 divisors (see below), whose sum is σ = 390941056. Its totient is φ = 146602872.

The previous prime is 256555027. The next prime is 256555063. The reversal of 256555047 is 740555652.

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

It is not a de Polignac number, because 256555047 - 2⁶ = 256554983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256554996 and 256555014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256555027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6108433 + ... + 6108474.

It is an arithmetic number, because the mean of its divisors is an integer number (48867632).

Almost surely, 2^256555047 is an apocalyptic number.

256555047 is a deficient number, since it is larger than the sum of its proper divisors (134386009).

256555047 is a wasteful number, since it uses less digits than its factorization.

256555047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12216917.

The product of its (nonzero) digits is 210000, while the sum is 39.

The square root of 256555047 is about 16017.3358271593. The cubic root of 256555047 is about 635.4189865082.

The spelling of 256555047 in words is "two hundred fifty-six million, five hundred fifty-five thousand, forty-seven".