85811488517149 has 2 divisors, whose sum is σ = 85811488517150. Its totient is φ = 85811488517148.

The previous prime is 85811488516979. The next prime is 85811488517191. The reversal of 85811488517149 is 94171588411858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56251770013924 + 29559718503225 = 7500118^2 + 5436885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85811488517149 is a prime.

It is a super-4 number, since 4×85811488517149⁴ (a number of 57 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85811488514149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42905744258574 + 42905744258575.

It is an arithmetic number, because the mean of its divisors is an integer number (42905744258575).

Almost surely, 2^{85811488517149} is an apocalyptic number.

It is an amenable number.

85811488517149 is a deficient number, since it is larger than the sum of its proper divisors (1).

85811488517149 is an equidigital number, since it uses as much as digits as its factorization.

85811488517149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103219200, while the sum is 70.

The spelling of 85811488517149 in words is "eighty-five trillion, eight hundred eleven billion, four hundred eighty-eight million, five hundred seventeen thousand, one hundred forty-nine".