256533065 has 8 divisors (see below), whose sum is σ = 308043648. Its totient is φ = 205090480.

The previous prime is 256533061. The next prime is 256533071. The reversal of 256533065 is 560335652.

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

It is not a de Polignac number, because 256533065 - 2² = 256533061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256533061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8291 + ... + 24120.

It is an arithmetic number, because the mean of its divisors is an integer number (38505456).

Almost surely, 2^256533065 is an apocalyptic number.

It is an amenable number.

256533065 is a deficient number, since it is larger than the sum of its proper divisors (51510583).

256533065 is a wasteful number, since it uses less digits than its factorization.

256533065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33999.

The product of its (nonzero) digits is 81000, while the sum is 35.

The square root of 256533065 is about 16016.6496184439. The cubic root of 256533065 is about 635.4008381234.

The spelling of 256533065 in words is "two hundred fifty-six million, five hundred thirty-three thousand, sixty-five".