85909079887 has 2 divisors, whose sum is σ = 85909079888. Its totient is φ = 85909079886.

The previous prime is 85909079873. The next prime is 85909080007. The reversal of 85909079887 is 78897090958.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85909079887 - 2³¹ = 83761596239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85909079287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42954539943 + 42954539944.

It is an arithmetic number, because the mean of its divisors is an integer number (42954539944).

Almost surely, 2^85909079887 is an apocalyptic number.

85909079887 is a deficient number, since it is larger than the sum of its proper divisors (1).

85909079887 is an equidigital number, since it uses as much as digits as its factorization.

85909079887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91445760, while the sum is 70.

The spelling of 85909079887 in words is "eighty-five billion, nine hundred nine million, seventy-nine thousand, eight hundred eighty-seven".