85231809853 has 2 divisors, whose sum is σ = 85231809854. Its totient is φ = 85231809852.

The previous prime is 85231809811. The next prime is 85231809877. The reversal of 85231809853 is 35890813258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51120305604 + 34111504249 = 226098^2 + 184693^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85231809853 is a prime.

It is a super-2 number, since 2×85231809853² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 85231809853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85231809253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42615904926 + 42615904927.

It is an arithmetic number, because the mean of its divisors is an integer number (42615904927).

Almost surely, 2^85231809853 is an apocalyptic number.

It is an amenable number.

85231809853 is a deficient number, since it is larger than the sum of its proper divisors (1).

85231809853 is an equidigital number, since it uses as much as digits as its factorization.

85231809853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 85231809853 in words is "eighty-five billion, two hundred thirty-one million, eight hundred nine thousand, eight hundred fifty-three".