256433263663 has 4 divisors (see below), whose sum is σ = 256434463440. Its totient is φ = 256432063888.

The previous prime is 256433263661. The next prime is 256433263687. The reversal of 256433263663 is 366362334652.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 256433263663 - 2¹ = 256433263661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256433263661) 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, 182470 + ... + 739027.

It is an arithmetic number, because the mean of its divisors is an integer number (64108615860).

Almost surely, 2^256433263663 is an apocalyptic number.

256433263663 is a deficient number, since it is larger than the sum of its proper divisors (1199777).

256433263663 is an equidigital number, since it uses as much as digits as its factorization.

256433263663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199776.

The product of its digits is 8398080, while the sum is 49.

The spelling of 256433263663 in words is "two hundred fifty-six billion, four hundred thirty-three million, two hundred sixty-three thousand, six hundred sixty-three".