85801436509 has 2 divisors, whose sum is σ = 85801436510. Its totient is φ = 85801436508.

The previous prime is 85801436437. The next prime is 85801436533. The reversal of 85801436509 is 90563410858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55638430884 + 30163005625 = 235878^2 + 173675^2 .

It is a cyclic number.

It is not a de Polignac number, because 85801436509 - 2⁹ = 85801435997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85801436549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42900718254 + 42900718255.

It is an arithmetic number, because the mean of its divisors is an integer number (42900718255).

Almost surely, 2^85801436509 is an apocalyptic number.

It is an amenable number.

85801436509 is a deficient number, since it is larger than the sum of its proper divisors (1).

85801436509 is an equidigital number, since it uses as much as digits as its factorization.

85801436509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 85801436509 in words is "eighty-five billion, eight hundred one million, four hundred thirty-six thousand, five hundred nine".