85780205587 has 2 divisors, whose sum is σ = 85780205588. Its totient is φ = 85780205586.

The previous prime is 85780205471. The next prime is 85780205627. The reversal of 85780205587 is 78550208758.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85780205587 is a prime.

It is not a weakly prime, because it can be changed into another prime (85780205087) 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, 42890102793 + 42890102794.

It is an arithmetic number, because the mean of its divisors is an integer number (42890102794).

Almost surely, 2^85780205587 is an apocalyptic number.

85780205587 is a deficient number, since it is larger than the sum of its proper divisors (1).

85780205587 is an equidigital number, since it uses as much as digits as its factorization.

85780205587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272000, while the sum is 55.

The spelling of 85780205587 in words is "eighty-five billion, seven hundred eighty million, two hundred five thousand, five hundred eighty-seven".