56778487837 has 2 divisors, whose sum is σ = 56778487838. Its totient is φ = 56778487836.

The previous prime is 56778487763. The next prime is 56778487849. The reversal of 56778487837 is 73878487765.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56600692281 + 177795556 = 237909^2 + 13334^2 .

It is a cyclic number.

It is not a de Polignac number, because 56778487837 - 2³¹ = 54631004189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56778487877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28389243918 + 28389243919.

It is an arithmetic number, because the mean of its divisors is an integer number (28389243919).

Almost surely, 2^56778487837 is an apocalyptic number.

It is an amenable number.

56778487837 is a deficient number, since it is larger than the sum of its proper divisors (1).

56778487837 is an equidigital number, since it uses as much as digits as its factorization.

56778487837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 442552320, while the sum is 70.

The spelling of 56778487837 in words is "fifty-six billion, seven hundred seventy-eight million, four hundred eighty-seven thousand, eight hundred thirty-seven".