5278878361 has 2 divisors, whose sum is σ = 5278878362. Its totient is φ = 5278878360.

The previous prime is 5278878347. The next prime is 5278878377. The reversal of 5278878361 is 1638788725.

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., 3370499136 + 1908379225 = 58056^2 + 43685^2 .

It is a cyclic number.

It is not a de Polignac number, because 5278878361 - 2¹⁷ = 5278747289 is a prime.

It is not a weakly prime, because it can be changed into another prime (5278878061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639439180 + 2639439181.

It is an arithmetic number, because the mean of its divisors is an integer number (2639439181).

Almost surely, 2^5278878361 is an apocalyptic number.

It is an amenable number.

5278878361 is a deficient number, since it is larger than the sum of its proper divisors (1).

5278878361 is an equidigital number, since it uses as much as digits as its factorization.

5278878361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 55.

The square root of 5278878361 is about 72655.8900640547. The cubic root of 5278878361 is about 1741.1942258622.

The spelling of 5278878361 in words is "five billion, two hundred seventy-eight million, eight hundred seventy-eight thousand, three hundred sixty-one".