87845471977 has 2 divisors, whose sum is σ = 87845471978. Its totient is φ = 87845471976.

The previous prime is 87845471963. The next prime is 87845472037. The reversal of 87845471977 is 77917454878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43958992896 + 43886479081 = 209664^2 + 209491^2 .

It is a cyclic number.

It is not a de Polignac number, because 87845471977 - 2¹⁹ = 87844947689 is a prime.

It is not a weakly prime, because it can be changed into another prime (87845471927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43922735988 + 43922735989.

It is an arithmetic number, because the mean of its divisors is an integer number (43922735989).

Almost surely, 2^87845471977 is an apocalyptic number.

It is an amenable number.

87845471977 is a deficient number, since it is larger than the sum of its proper divisors (1).

87845471977 is an equidigital number, since it uses as much as digits as its factorization.

87845471977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110638080, while the sum is 67.

The spelling of 87845471977 in words is "eighty-seven billion, eight hundred forty-five million, four hundred seventy-one thousand, nine hundred seventy-seven".