4778568221 has 4 divisors (see below), whose sum is σ = 5461220832. Its totient is φ = 4095915612.

The previous prime is 4778568173. The next prime is 4778568239. The reversal of 4778568221 is 1228658774.

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 4778568221 - 2¹⁰ = 4778567197 is a prime.

It is a super-2 number, since 2×4778568221² = 45669428485502209682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4778568221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4778568281) 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, 341326295 + ... + 341326308.

It is an arithmetic number, because the mean of its divisors is an integer number (1365305208).

Almost surely, 2^4778568221 is an apocalyptic number.

It is an amenable number.

4778568221 is a deficient number, since it is larger than the sum of its proper divisors (682652611).

4778568221 is an equidigital number, since it uses as much as digits as its factorization.

4778568221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682652610.

The product of its digits is 1505280, while the sum is 50.

The square root of 4778568221 is about 69127.1887248426. The cubic root of 4778568221 is about 1684.3509927362.

The spelling of 4778568221 in words is "four billion, seven hundred seventy-eight million, five hundred sixty-eight thousand, two hundred twenty-one".