256262772062221 has 4 divisors (see below), whose sum is σ = 256263371281152. Its totient is φ = 256262172843292.

The previous prime is 256262772062201. The next prime is 256262772062251. The reversal of 256262772062221 is 122260277262652.

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 256262772062221 - 2¹⁷ = 256262771931149 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 (256262772062201) 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, 298967515 + ... + 299823448.

It is an arithmetic number, because the mean of its divisors is an integer number (64065842820288).

Almost surely, 2^{256262772062221} is an apocalyptic number.

It is an amenable number.

256262772062221 is a deficient number, since it is larger than the sum of its proper divisors (599218931).

256262772062221 is an equidigital number, since it uses as much as digits as its factorization.

256262772062221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599218930.

The product of its (nonzero) digits is 6773760, while the sum is 52.

The spelling of 256262772062221 in words is "two hundred fifty-six trillion, two hundred sixty-two billion, seven hundred seventy-two million, sixty-two thousand, two hundred twenty-one".