87778576057 has 2 divisors, whose sum is σ = 87778576058. Its totient is φ = 87778576056.

The previous prime is 87778576043. The next prime is 87778576069. The reversal of 87778576057 is 75067587778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87585810601 + 192765456 = 295949^2 + 13884^2 .

It is a cyclic number.

It is not a de Polignac number, because 87778576057 - 2¹⁹ = 87778051769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87778575983 and 87778576001.

It is not a weakly prime, because it can be changed into another prime (87778576037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43889288028 + 43889288029.

It is an arithmetic number, because the mean of its divisors is an integer number (43889288029).

Almost surely, 2^87778576057 is an apocalyptic number.

It is an amenable number.

87778576057 is a deficient number, since it is larger than the sum of its proper divisors (1).

87778576057 is an equidigital number, since it uses as much as digits as its factorization.

87778576057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161347200, while the sum is 67.

The spelling of 87778576057 in words is "eighty-seven billion, seven hundred seventy-eight million, five hundred seventy-six thousand, fifty-seven".