85866318061 has 2 divisors, whose sum is σ = 85866318062. Its totient is φ = 85866318060.

The previous prime is 85866318053. The next prime is 85866318091. The reversal of 85866318061 is 16081366858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78246075625 + 7620242436 = 279725^2 + 87294^2 .

It is a cyclic number.

It is not a de Polignac number, because 85866318061 - 2³ = 85866318053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85866318091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42933159030 + 42933159031.

It is an arithmetic number, because the mean of its divisors is an integer number (42933159031).

Almost surely, 2^85866318061 is an apocalyptic number.

It is an amenable number.

85866318061 is a deficient number, since it is larger than the sum of its proper divisors (1).

85866318061 is an equidigital number, since it uses as much as digits as its factorization.

85866318061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 85866318061 in words is "eighty-five billion, eight hundred sixty-six million, three hundred eighteen thousand, sixty-one".