85755851281 has 3 divisors (see below), whose sum is σ = 85756144123. Its totient is φ = 85755558440.

The previous prime is 85755851267. The next prime is 85755851287. The reversal of 85755851281 is 18215855758.

The square root of 85755851281 is 292841.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3799612881 + 81956238400 = 61641^2 + 286280^2 .

It is not a de Polignac number, because 85755851281 - 2⁵ = 85755851249 is a prime.

It is a super-2 number, since 2×85755851281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85755851287) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 146421 + ... + 439261.

Almost surely, 2^85755851281 is an apocalyptic number.

85755851281 is the 292841-st square number.

85755851281 is the 146421-st centered octagonal number.

It is an amenable number.

85755851281 is a deficient number, since it is larger than the sum of its proper divisors (292842).

85755851281 is an frugal number, since it uses more digits than its factorization.

85755851281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585682 (or 292841 counting only the distinct ones).

The product of its digits is 4480000, while the sum is 55.

The spelling of 85755851281 in words is "eighty-five billion, seven hundred fifty-five million, eight hundred fifty-one thousand, two hundred eighty-one".