85811260378061 has 2 divisors, whose sum is σ = 85811260378062. Its totient is φ = 85811260378060.

The previous prime is 85811260378009. The next prime is 85811260378201. The reversal of 85811260378061 is 16087306211858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83951296300036 + 1859964078025 = 9162494^2 + 1363805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85811260378061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85811260377988 and 85811260378006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85811260378561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42905630189030 + 42905630189031.

It is an arithmetic number, because the mean of its divisors is an integer number (42905630189031).

Almost surely, 2^{85811260378061} is an apocalyptic number.

It is an amenable number.

85811260378061 is a deficient number, since it is larger than the sum of its proper divisors (1).

85811260378061 is an equidigital number, since it uses as much as digits as its factorization.

85811260378061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3870720, while the sum is 56.

The spelling of 85811260378061 in words is "eighty-five trillion, eight hundred eleven billion, two hundred sixty million, three hundred seventy-eight thousand, sixty-one".