256633336653 has 4 divisors (see below), whose sum is σ = 342177782208. Its totient is φ = 171088891100.

The previous prime is 256633336601. The next prime is 256633336777. The reversal of 256633336653 is 356633336652.

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 256633336653 - 2¹³ = 256633328461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256633336596 and 256633336605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256633331653) 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, 42772222773 + ... + 42772222778.

It is an arithmetic number, because the mean of its divisors is an integer number (85544445552).

Almost surely, 2^256633336653 is an apocalyptic number.

It is an amenable number.

256633336653 is a deficient number, since it is larger than the sum of its proper divisors (85544445555).

256633336653 is an equidigital number, since it uses as much as digits as its factorization.

256633336653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85544445554.

The product of its digits is 15746400, while the sum is 51.

Subtracting 256633336653 from its reverse (356633336652), we obtain a palindrome (99999999999).

The spelling of 256633336653 in words is "two hundred fifty-six billion, six hundred thirty-three million, three hundred thirty-six thousand, six hundred fifty-three".