71283221857 has 4 divisors (see below), whose sum is σ = 73741264020. Its totient is φ = 68825179696.

The previous prime is 71283221851. The next prime is 71283221897. The reversal of 71283221857 is 75812238217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75812238217 = 53 ⋅1430419589.

It can be written as a sum of positive squares in 2 ways, for example, as 54423757521 + 16859464336 = 233289^2 + 129844^2 .

It is a cyclic number.

It is not a de Polignac number, because 71283221857 - 2⁷ = 71283221729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71283221851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1229021038 + ... + 1229021095.

It is an arithmetic number, because the mean of its divisors is an integer number (18435316005).

Almost surely, 2^71283221857 is an apocalyptic number.

It is an amenable number.

71283221857 is a deficient number, since it is larger than the sum of its proper divisors (2458042163).

71283221857 is a wasteful number, since it uses less digits than its factorization.

71283221857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458042162.

The product of its digits is 376320, while the sum is 46.

The spelling of 71283221857 in words is "seventy-one billion, two hundred eighty-three million, two hundred twenty-one thousand, eight hundred fifty-seven".