85780205873 has 2 divisors, whose sum is σ = 85780205874. Its totient is φ = 85780205872.

The previous prime is 85780205867. The next prime is 85780205897. The reversal of 85780205873 is 37850208758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51789015184 + 33991190689 = 227572^2 + 184367^2 .

It is a cyclic number.

It is not a de Polignac number, because 85780205873 - 2²⁴ = 85763428657 is a prime.

It is a super-2 number, since 2×85780205873² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85780207873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42890102936 + 42890102937.

It is an arithmetic number, because the mean of its divisors is an integer number (42890102937).

Almost surely, 2^85780205873 is an apocalyptic number.

It is an amenable number.

85780205873 is a deficient number, since it is larger than the sum of its proper divisors (1).

85780205873 is an equidigital number, since it uses as much as digits as its factorization.

85780205873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3763200, while the sum is 53.

The spelling of 85780205873 in words is "eighty-five billion, seven hundred eighty million, two hundred five thousand, eight hundred seventy-three".