85722857281 has 2 divisors, whose sum is σ = 85722857282. Its totient is φ = 85722857280.

The previous prime is 85722857279. The next prime is 85722857321. The reversal of 85722857281 is 18275822758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73845345025 + 11877512256 = 271745^2 + 108984^2 .

It is a cyclic number.

It is not a de Polignac number, because 85722857281 - 2¹ = 85722857279 is a prime.

It is a super-2 number, since 2×85722857281² (a number of 23 digits) contains 22 as substring.

Together with 85722857279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (85722857581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42861428640 + 42861428641.

It is an arithmetic number, because the mean of its divisors is an integer number (42861428641).

Almost surely, 2^85722857281 is an apocalyptic number.

It is an amenable number.

85722857281 is a deficient number, since it is larger than the sum of its proper divisors (1).

85722857281 is an equidigital number, since it uses as much as digits as its factorization.

85722857281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5017600, while the sum is 55.

The spelling of 85722857281 in words is "eighty-five billion, seven hundred twenty-two million, eight hundred fifty-seven thousand, two hundred eighty-one".