85677401209 has 2 divisors, whose sum is σ = 85677401210. Its totient is φ = 85677401208.

The previous prime is 85677401191. The next prime is 85677401213. The reversal of 85677401209 is 90210477658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67979089984 + 17698311225 = 260728^2 + 133035^2 .

It is a cyclic number.

It is not a de Polignac number, because 85677401209 - 2¹⁹ = 85676876921 is a prime.

It is not a weakly prime, because it can be changed into another prime (85677401009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42838700604 + 42838700605.

It is an arithmetic number, because the mean of its divisors is an integer number (42838700605).

Almost surely, 2^85677401209 is an apocalyptic number.

It is an amenable number.

85677401209 is a deficient number, since it is larger than the sum of its proper divisors (1).

85677401209 is an equidigital number, since it uses as much as digits as its factorization.

85677401209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 85677401209 in words is "eighty-five billion, six hundred seventy-seven million, four hundred one thousand, two hundred nine".