87847771057 has 2 divisors, whose sum is σ = 87847771058. Its totient is φ = 87847771056.

The previous prime is 87847771027. The next prime is 87847771073. The reversal of 87847771057 is 75017774878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61146903841 + 26700867216 = 247279^2 + 163404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87847771057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87847770986 and 87847771004.

It is not a weakly prime, because it can be changed into another prime (87847771027) 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, 43923885528 + 43923885529.

It is an arithmetic number, because the mean of its divisors is an integer number (43923885529).

Almost surely, 2^87847771057 is an apocalyptic number.

It is an amenable number.

87847771057 is a deficient number, since it is larger than the sum of its proper divisors (1).

87847771057 is an equidigital number, since it uses as much as digits as its factorization.

87847771057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21512960, while the sum is 61.

The spelling of 87847771057 in words is "eighty-seven billion, eight hundred forty-seven million, seven hundred seventy-one thousand, fifty-seven".