256650243 has 4 divisors (see below), whose sum is σ = 342200328. Its totient is φ = 171100160.

The previous prime is 256650211. The next prime is 256650257. The reversal of 256650243 is 342056652.

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

It is a cyclic number.

It is not a de Polignac number, because 256650243 - 2⁵ = 256650211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256650143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42775038 + ... + 42775043.

It is an arithmetic number, because the mean of its divisors is an integer number (85550082).

Almost surely, 2^256650243 is an apocalyptic number.

256650243 is a deficient number, since it is larger than the sum of its proper divisors (85550085).

256650243 is an equidigital number, since it uses as much as digits as its factorization.

256650243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85550084.

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 256650243 is about 16020.3072067923. The cubic root of 256650243 is about 635.4975685597.

The spelling of 256650243 in words is "two hundred fifty-six million, six hundred fifty thousand, two hundred forty-three".