256663941 has 4 divisors (see below), whose sum is σ = 342218592. Its totient is φ = 171109292.

The previous prime is 256663937. The next prime is 256663961. The reversal of 256663941 is 149366652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256663941 - 2² = 256663937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256663893 and 256663902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256663921) 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 3 ways as a sum of consecutive naturals, for example, 42777321 + ... + 42777326.

It is an arithmetic number, because the mean of its divisors is an integer number (85554648).

Almost surely, 2^256663941 is an apocalyptic number.

It is an amenable number.

256663941 is a deficient number, since it is larger than the sum of its proper divisors (85554651).

256663941 is an equidigital number, since it uses as much as digits as its factorization.

256663941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85554650.

The product of its digits is 233280, while the sum is 42.

The square root of 256663941 is about 16020.7347209796. The cubic root of 256663941 is about 635.5088743362.

The spelling of 256663941 in words is "two hundred fifty-six million, six hundred sixty-three thousand, nine hundred forty-one".