256236632653 has 4 divisors (see below), whose sum is σ = 256240848160. Its totient is φ = 256232417148.

The previous prime is 256236632623. The next prime is 256236632671. The reversal of 256236632653 is 356236632652.

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 a de Polignac number, because none of the positive numbers 2^k-256236632653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256236632597 and 256236632606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256236632623) 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, 2015223 + ... + 2138596.

It is an arithmetic number, because the mean of its divisors is an integer number (64060212040).

Almost surely, 2^256236632653 is an apocalyptic number.

It is an amenable number.

256236632653 is a deficient number, since it is larger than the sum of its proper divisors (4215507).

256236632653 is an equidigital number, since it uses as much as digits as its factorization.

256236632653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215506.

The product of its digits is 6998400, while the sum is 49.

Subtracting 256236632653 from its reverse (356236632652), we obtain a palindrome (99999999999).

The spelling of 256236632653 in words is "two hundred fifty-six billion, two hundred thirty-six million, six hundred thirty-two thousand, six hundred fifty-three".