81371256282 has 24 divisors (see below), whose sum is σ = 176317819860. Its totient is φ = 27121685760.

The previous prime is 81371256277. The next prime is 81371256287. The reversal of 81371256282 is 28265217318.

81371256282 is a `hidden beast` number, since 8 + 1 + 3 + 7 + 1 + 2 + 562 + 82 = 666.

It is an interprime number because it is at equal distance from previous prime (81371256277) and next prime (81371256287).

It can be written as a sum of positive squares in 2 ways, for example, as 78634815561 + 2736440721 = 280419^2 + 52311^2 .

It is not an unprimeable number, because it can be changed into a prime (81371256287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80682 + ... + 411402.

Almost surely, 2^81371256282 is an apocalyptic number.

81371256282 is an abundant number, since it is smaller than the sum of its proper divisors (94946563578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81371256282 is a wasteful number, since it uses less digits than its factorization.

81371256282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344398 (or 344395 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 81371256282 in words is "eighty-one billion, three hundred seventy-one million, two hundred fifty-six thousand, two hundred eighty-two".