256386591554 has 4 divisors (see below), whose sum is σ = 384579887334. Its totient is φ = 128193295776.

The previous prime is 256386591523. The next prime is 256386591569. The reversal of 256386591554 is 455195683652.

256386591554 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 152628518329 + 103758073225 = 390677^2 + 322115^2 .

It is a super-4 number, since 4×256386591554⁴ (a number of 47 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256386591493 and 256386591502.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64096647887 + ... + 64096647890.

Almost surely, 2^256386591554 is an apocalyptic number.

256386591554 is a deficient number, since it is larger than the sum of its proper divisors (128193295780).

256386591554 is a wasteful number, since it uses less digits than its factorization.

256386591554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128193295779.

The product of its digits is 38880000, while the sum is 59.

The spelling of 256386591554 in words is "two hundred fifty-six billion, three hundred eighty-six million, five hundred ninety-one thousand, five hundred fifty-four".