4778568461 has 2 divisors, whose sum is σ = 4778568462. Its totient is φ = 4778568460.

The previous prime is 4778568391. The next prime is 4778568547. The reversal of 4778568461 is 1648658774.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4552065961 + 226502500 = 67469^2 + 15050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4778568461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4778568397 and 4778568406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4778565461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2389284230 + 2389284231.

It is an arithmetic number, because the mean of its divisors is an integer number (2389284231).

Almost surely, 2^4778568461 is an apocalyptic number.

It is an amenable number.

4778568461 is a deficient number, since it is larger than the sum of its proper divisors (1).

4778568461 is an equidigital number, since it uses as much as digits as its factorization.

4778568461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9031680, while the sum is 56.

The square root of 4778568461 is about 69127.1904607731. The cubic root of 4778568461 is about 1684.3510209347.

The spelling of 4778568461 in words is "four billion, seven hundred seventy-eight million, five hundred sixty-eight thousand, four hundred sixty-one".