256661226 has 48 divisors (see below), whose sum is σ = 567103680. Its totient is φ = 83878080.

The previous prime is 256661213. The next prime is 256661227. The reversal of 256661226 is 622166652.

It is not an unprimeable number, because it can be changed into a prime (256661227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209251 + ... + 210473.

It is an arithmetic number, because the mean of its divisors is an integer number (11814660).

Almost surely, 2^256661226 is an apocalyptic number.

256661226 is an abundant number, since it is smaller than the sum of its proper divisors (310442454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256661226 is a wasteful number, since it uses less digits than its factorization.

256661226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451 (or 1448 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 256661226 is about 16020.6499868139. The cubic root of 256661226 is about 635.5066335167.

The spelling of 256661226 in words is "two hundred fifty-six million, six hundred sixty-one thousand, two hundred twenty-six".