256953065 has 8 divisors (see below), whose sum is σ = 312568008. Its totient is φ = 202746240.

The previous prime is 256953041. The next prime is 256953091. The reversal of 256953065 is 560359652.

It can be written as a sum of positive squares in 4 ways, for example, as 22005481 + 234947584 = 4691^2 + 15328^2 .

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

It is not a de Polignac number, because 256953065 - 2¹⁸ = 256690921 is a prime.

It is a super-2 number, since 2×256953065² = 132049755225788450, 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 7 ways as a sum of consecutive naturals, for example, 351626 + ... + 352355.

It is an arithmetic number, because the mean of its divisors is an integer number (39071001).

Almost surely, 2^256953065 is an apocalyptic number.

It is an amenable number.

256953065 is a deficient number, since it is larger than the sum of its proper divisors (55614943).

256953065 is an equidigital number, since it uses as much as digits as its factorization.

256953065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704059.

The product of its (nonzero) digits is 243000, while the sum is 41.

The square root of 256953065 is about 16029.7556126099. The cubic root of 256953065 is about 635.7474118279.

The spelling of 256953065 in words is "two hundred fifty-six million, nine hundred fifty-three thousand, sixty-five".