256355825 has 12 divisors (see below), whose sum is σ = 346779888. Its totient is φ = 186440400.

The previous prime is 256355791. The next prime is 256355849. The reversal of 256355825 is 528553652.

It is not a de Polignac number, because 256355825 - 2¹⁶ = 256290289 is a prime.

It is a super-2 number, since 2×256355825² = 131436618022861250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 465827 + ... + 466376.

It is an arithmetic number, because the mean of its divisors is an integer number (28898324).

Almost surely, 2^256355825 is an apocalyptic number.

256355825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256355825 is a deficient number, since it is larger than the sum of its proper divisors (90424063).

256355825 is a wasteful number, since it uses less digits than its factorization.

256355825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932224 (or 932219 counting only the distinct ones).

The product of its digits is 360000, while the sum is 41.

The square root of 256355825 is about 16011.1156700587. The cubic root of 256355825 is about 635.2544705188.

The spelling of 256355825 in words is "two hundred fifty-six million, three hundred fifty-five thousand, eight hundred twenty-five".