256609594071 has 36 divisors (see below), whose sum is σ = 403158913560. Its totient is φ = 156841077600.

The previous prime is 256609594069. The next prime is 256609594091. The reversal of 256609594071 is 170495906652.

256609594071 is a `hidden beast` number, since 2 + 566 + 0 + 9 + 5 + 9 + 4 + 0 + 71 = 666.

It is not a de Polignac number, because 256609594071 - 2¹ = 256609594069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256609593999 and 256609594017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256609594061) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 616440 + ... + 945101.

It is an arithmetic number, because the mean of its divisors is an integer number (11198858710).

Almost surely, 2^256609594071 is an apocalyptic number.

256609594071 is a deficient number, since it is larger than the sum of its proper divisors (146549319489).

256609594071 is a wasteful number, since it uses less digits than its factorization.

256609594071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561628 (or 1561594 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

It can be divided in two parts, 25660959 and 4071, that added together give a triangular number (25665030 = T₇₁₆₄).

The spelling of 256609594071 in words is "two hundred fifty-six billion, six hundred nine million, five hundred ninety-four thousand, seventy-one".